{ "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-2026-34384", "tracking": { "current_release_date": "2026-04-01T23:19:32.874480Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-34384", "initial_release_date": "2026-03-31T21:26:15.890833Z", "revision_history": [ { "date": "2026-03-31T21:26:15.890833Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-31T21:26:17.525058Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-31T21:39:25.683085Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-31T21:39:27.808710Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-31T23:58:23.626612Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-04-01T15:12:52.477485Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-01T15:13:07.064303Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-04-01T23:00:36.198510Z", "number": "8", "summary": "Products created (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-04-01T23:00:39.447728Z", "number": "9", "summary": "NCSC Score updated." } ], "status": "interim", "version": "9" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<5.0.8", "product": { "name": "vers:unknown/<5.0.8", "product_id": "CSAFPID-5982849", "product_identification_helper": { "cpe": "cpe:2.3:a:admidio:admidio:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Admidio" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<5.0.8", "product": { "name": "vers:unknown/<5.0.8", "product_id": "CSAFPID-5969624" } } ], "category": "product_name", "name": "admidio" } ], "category": "vendor", "name": "Admidio" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-34384", "cwe": { "id": "CWE-352", "name": "Cross-Site Request Forgery (CSRF)" }, "notes": [ { "category": "description", "text": "Admidio is an open-source user management solution. Prior to version 5.0.8, the create_user, assign_member, and assign_user action modes in modules/registration.php approve pending user registrations via GET request without validating a CSRF token. Unlike the delete_user mode in the same file (which correctly validates the token), these three approval actions read their parameters from $_GET and perform irreversible state changes without any protection. An attacker who has submitted a pending registration can extract their own user UUID from the registration confirmation email URL, then trick any user with the rol_approve_users right into visiting a crafted URL that automatically approves the registration. This bypasses the manual registration approval workflow entirely. This issue has been patched in version 5.0.8.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34384" }, { "category": "description", "text": "Admidio is an open-source user management solution. Prior to version 5.0.8, the create_user, assign_member, and assign_user action modes in modules/registration.php approve pending user registrations via GET request without validating a CSRF token. Unlike the delete_user mode in the same file (which correctly validates the token), these three approval actions read their parameters from $_GET and perform irreversible state changes without any protection. An attacker who has submitted a pending registration can extract their own user UUID from the registration confirmation email URL, then trick any user with the rol_approve_users right into visiting a crafted URL that automatically approves the registration. This bypasses the manual registration approval workflow entirely. This issue has been patched in version 5.0.8.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34384.json" }, { "category": "description", "text": "## Summary\n\nThe create_user, assign_member, and assign_user action modes in modules/registration.php approve pending user registrations via GET request without validating a CSRF token. Unlike the delete_user mode in the same file (which correctly validates the token), these three approval actions read their parameters from $_GET and perform irreversible state changes without any protection. An attacker who has submitted a pending registration can extract their own user UUID from the registration confirmation email URL, then trick any user with the rol_approve_users right into visiting a crafted URL that automatically approves the registration. This bypasses the manual registration approval workflow entirely.\n\n## Details\n\n### CSRF Protection Is Present for delete_user but Absent for Approval Modes\n\nFile: modules/registration.php, lines 90-128\n\nThe delete_user mode validates the CSRF token (line 99), but the three approval modes do not:\n\n```php\n// assign_member and assign_user: no CSRF check\n} elseif (in_array($getMode, array('assign_member', 'assign_user'))) {\n $registrationService = new RegistrationService($gDb, $getUserUUID);\n $message = $registrationService->assignRegistration($getUserUUIDAssigned, $getMode === 'assign_member');\n $gMessage->setForwardUrl($message['forwardUrl']);\n $gMessage->show($message['message']);\n\n// create_user: no CSRF check\n} elseif ($getMode === 'create_user') {\n $registrationUser->acceptRegistration();\n if ($gCurrentUser->isAdministratorRoles()) {\n admRedirect(SecurityUtils::encodeUrl(ADMIDIO_URL . FOLDER_MODULES.'/profile/roles.php',\n array('accept_registration' => true, 'user_uuid' => $getUserUUID)));\n }\n\n// delete_user: CSRF IS validated\n} elseif ($getMode === 'delete_user') {\n SecurityUtils::validateCsrfToken($_POST['adm_csrf_token']); // <-- protected\n $registrationUser->delete();\n}\n```\n\nThe three approval modes read both UUIDs exclusively from $_GET (lines 41-43):\n\nThe approve action modes accept $_GET parameters `user_uuid` and `user_uuid_assigned` without any POST body or CSRF token. Both parameters pass through `admFuncVariableIsValid()` with `uuid` type validation, which prevents SQL injection but provides no CSRF protection.\n\n### User UUID Is Known to the Attacker from Registration Email\n\nFile: `D:/bugcrowd/admidio/repo/src/Infrastructure/Service/RegistrationService.php`, lines 154-157\n\nWhen a user submits a registration, Admidio sends a confirmation email containing a URL of the form:\n\n```\nhttps://TARGET/adm_program/modules/registration.php?id=VALIDATION_ID&user_uuid=REGISTRANT_UUID\n```\n\nThe `user_uuid` in this URL is the registrant's own UUID. The attacker has this UUID because they received the confirmation email for their own registration.\n\n### isAdministratorRegistration() Is a Delegated Right\n\nFile: `D:/bugcrowd/admidio/repo/src/Users/Entity/User.php`, lines 1603-1606\n\n```php\npublic function isAdministratorRegistration(): bool\n{\n return $this->checkRolesRight('rol_approve_users');\n}\n```\n\nThe `rol_approve_users` right is a delegated organizational privilege, not full system administrator access. Any member designated to review registrations -- for example, a membership secretary or club administrator -- is a valid CSRF victim.\n\n## PoC\n\n**Scenario: Attacker bypasses manual registration approval**\n\nPrerequisites: (1) Manual registration approval is enabled. (2) The attacker submits a registration form and receives a confirmation email with their `user_uuid`. (3) After clicking the confirmation link, their registration enters the pending queue.\n\n**Step 1: Attacker extracts their own user_uuid from the registration email**\n\nThe confirmation email contains a link of the form:\n\n```\nhttps://TARGET/adm_program/modules/registration.php?id=VALIDATION_ID&user_uuid=ATTACKER_UUID\n```\n\nThe `ATTACKER_UUID` is visible to the attacker from their own email.\n\n**Step 2: CSRF auto-approval via image tag**\n\nThe attacker hosts a page that the victim (admin with `rol_approve_users` right) visits:\n\n```html\n\n```\n\nWhen the victim loads this page, Admidio silently accepts the attacker registration and assigns default organization roles. No confirmation or token is required.\n\n**Step 3: Force-assign registration to an existing account (account takeover)**\n\nIf the attacker knows the UUID of an existing member (obtainable from profile page URLs when the user list is visible) and has a pending registration:\n\n```html\n\n```\n\nThis merges the pending registration into the existing account, replacing that account login credentials with the attacker credentials.\n\n## Impact\n\n- **Manual Approval Bypass:** An attacker with a pending registration can force auto-approval without waiting for an administrator to manually review it. This grants them organization membership, including access to events, documents, mailing lists, and other role-restricted features.\n- **Account Takeover via assign_user CSRF:** If the attacker knows any member UUID (visible in profile page URLs), the `assign_user` mode merges the attacker registration into that member account, replacing the existing member login with the attacker credentials. This is a full account takeover requiring only that the victim admin visit a crafted URL.\n- **Low Attack Complexity:** The attacker only needs their own registration email to get their UUID. The CSRF payload is a plain GET request via an image tag -- no JavaScript required.\n- **Delegated Right:** The required victim right (`rol_approve_users`) is a common delegation target in organizations with membership approval workflows.\n\n## Recommended Fix\n\nAdd `SecurityUtils::validateCsrfToken($_POST[\"adm_csrf_token\"])` at the beginning of each approval action, consistent with how `delete_user` is already protected in the same file.\n\n```php\n// File: modules/registration.php\n\n} elseif (in_array($getMode, array('assign_member', 'assign_user'))) {\n // ADD: validate CSRF token\n SecurityUtils::validateCsrfToken($_POST['adm_csrf_token']);\n $registrationService = new RegistrationService($gDb, $getUserUUID);\n $message = $registrationService->assignRegistration($getUserUUIDAssigned, $getMode === 'assign_member');\n ...\n\n} elseif ($getMode === 'create_user') {\n // ADD: validate CSRF token\n SecurityUtils::validateCsrfToken($_POST['adm_csrf_token']);\n $registrationUser->acceptRegistration();\n ...\n\n} elseif ($getMode === 'delete_user') {\n SecurityUtils::validateCsrfToken($_POST['adm_csrf_token']); // already protected\n $registrationUser->delete();\n}\n```\n\nAdditionally, convert the approval action URLs from GET-based links to POST-form buttons (with the CSRF token in a hidden field). The existing `delete_user` button uses `callUrlHideElement()` which already sends the token in the POST body -- use the same pattern for approval buttons.", "title": "github - https://api.github.com/advisories/GHSA-ph84-r98x-2j22" }, { "category": "other", "text": "0.00013", "title": "EPSS" }, { "category": "other", "text": "3.4", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, Is related to CWE-352 (Cross-Site Request Forgery (CSRF))", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5969624", "CSAFPID-5982849" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34384" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34384.json" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-ph84-r98x-2j22" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/Admidio/admidio/commit/707171c188b3e8f36007fc3f2bccbfac896ed019" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-ph84-r98x-2j22" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34384" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-ph84-r98x-2j22" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N", "baseScore": 4.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5969624", "CSAFPID-5982849" ] } ], "title": "CVE-2026-34384" } ] }