{ "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-2026-33035", "tracking": { "current_release_date": "2026-03-26T00:51:26.230708Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33035", "initial_release_date": "2026-03-17T21:00:11.669490Z", "revision_history": [ { "date": "2026-03-17T21:00:11.669490Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-17T21:00:14.161979Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-19T11:40:20.954599Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:25:47.970014Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T18:25:57.307623Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:29:32.810653Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T18:29:35.006621Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:35:42.158209Z", "number": "8", "summary": "Unknown change." }, { "date": "2026-03-20T21:41:41.497885Z", "number": "9", "summary": "References created (1)." }, { "date": "2026-03-20T21:59:12.451325Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T21:59:15.323097Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-21T13:47:26.862545Z", "number": "12", "summary": "References removed (1)." }, { "date": "2026-03-22T00:51:52.622102Z", "number": "13", "summary": "References created (1)." }, { "date": "2026-03-22T11:24:54.813464Z", "number": "14", "summary": "References removed (1)." }, { "date": "2026-03-23T00:54:03.067614Z", "number": "15", "summary": "References created (1)." }, { "date": "2026-03-23T05:15:59.345162Z", "number": "16", "summary": "References removed (1)." }, { "date": "2026-03-24T20:51:42.881679Z", "number": "17", "summary": "CVSS created.| Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-24T20:51:45.645756Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:56:26.216555Z", "number": "19", "summary": "References created (1)." }, { "date": "2026-03-26T00:51:10.282144Z", "number": "20", "summary": "EPSS updated." }, { "date": "2026-03-26T00:51:16.999134Z", "number": "21", "summary": "NCSC Score updated." } ], "status": "interim", "version": "21" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<26.0", "product": { "name": "vers:unknown/<26.0", "product_id": "CSAFPID-5874460", "product_identification_helper": { "cpe": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "AVideo" } ], "category": "vendor", "name": "WWBN" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33035", "cwe": { "id": "CWE-79", "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')" }, "notes": [ { "category": "description", "text": "## Summary\n\nAVideo contains a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's `json_encode()` into a JavaScript function that renders it via `innerHTML`, bypassing encoding and achieving full script execution.\n\n\n## Root Cause\nThe vulnerability is caused by two issues working together:\n\n### 1. Source: Unescaped user input passed to JavaScript (videoNotFound.php)\n\n**File:** `view/videoNotFound.php` line 49\n\n```php\nif (!empty($_REQUEST['404ErrorMsg'])) {\n echo 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg']) . ');';\n}\n```\n\nPHP's `json_encode()` with default flags only escapes quotes (`\"` → `\\\"`) and backslashes. It does **NOT** escape HTML special characters (`<`, `>`, `/`). The resulting string contains raw HTML tags that are passed directly to JavaScript.\n\n### 2. Sink: innerHTML renders HTML tags as executable DOM (script.js)\n\n**File:** `view/js/script.js`\n\n```javascript\nfunction avideoAlertInfo(msg) { // line ~1891\n avideoAlert(\"\", msg, 'info'); // calls ↓\n}\n\nfunction avideoAlert(title, msg, type) { // line ~1270\n avideoAlertHTMLText(title, msg, type); // calls ↓\n}\n\nfunction avideoAlertHTMLText(title, msg, type) { // line ~1451\n var span = document.createElement(\"span\");\n span.innerHTML = msg; // line 1464 — XSS SINK\n swal({ content: span });\n}\n```\n\n`innerHTML` parses the string as HTML. Any ``, ``, or other HTML tags with event handlers are instantiated as real DOM elements, triggering JavaScript execution.\n\n### Data Flow\n\n```\nURL parameter (?404ErrorMsg=PAYLOAD)\n → $_REQUEST['404ErrorMsg']\n → json_encode() ← does NOT escape < > /\n → avideoAlertInfo()\n → avideoAlert()\n → avideoAlertHTMLText()\n → span.innerHTML = msg ← renders HTML tags, executes JS\n```\n\n---\n\n## Proof of Concept\n```\nhttps://localhost/view/videoNotFound.php?404ErrorMsg=\n```\n\"image\"\n\nThe page renders:\n```javascript\navideoAlertInfo(\"\");\n```\n\nWhich flows to `span.innerHTML = \"\"`. The browser creates an `` element, `src=x` fails to load, `onerror` fires `alert(document.domain)`.\n\n## Affected Code\n\n| File | Line | Issue |\n|------|------|-------|\n| `view/videoNotFound.php` | 49 | `json_encode()` does not escape `<` `>` for HTML context |\n| `view/js/script.js` | 1464 | `span.innerHTML = msg` renders user input as HTML |\n| `view/js/script.js` | 1282 | `span.innerHTML = msg` in `avideoAlertWithCookie()` |\n| `view/js/script.js` | 1335 | `span.innerHTML = __(msg,true)` in `avideoConfirm()` |\n| `view/js/script.js` | 1358 | `span.innerHTML = msg` in `avideoAlertOnceForceConfirm()` |\n\nThe `innerHTML` sink exists in 4 functions. Any future code that passes user input to `avideoAlertInfo()`, `avideoAlertWarning()`, `avideoAlertDanger()`, or `avideoAlertSuccess()` will create additional XSS vectors.\n\n\n## Remediation\n\n### Fix 1: Escape HTML in PHP (source fix)\n\n```php\n// view/videoNotFound.php line 49\n// BEFORE (vulnerable):\necho 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg']) . ');';\n\n// AFTER (fixed):\necho 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg'], JSON_HEX_TAG | JSON_HEX_AMP) . ');';\n```\n\n`JSON_HEX_TAG` converts `<` → `\\u003C` and `>` → `\\u003E`, preventing HTML injection.\n\n### Fix 2: Use textContent instead of innerHTML (sink fix, recommended)\n\n```javascript\n// view/js/script.js - all alert functions\n// BEFORE (vulnerable):\nspan.innerHTML = msg;\n\n// AFTER (fixed):\nspan.textContent = msg;\n```\n\n`textContent` treats the string as plain text — HTML tags are displayed literally, never parsed or executed.\n\n### Fix 3: Add Content-Security-Policy header (defense in depth)\n\n```\nContent-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'\n```\n\n## Impact\n\n- **Session hijacking** — steal `PHPSESSID` cookie (not HttpOnly by default)\n- **Account takeover** — use stolen session to change password or email\n- **Phishing** — inject a realistic login form inside the SweetAlert modal\n- **Worm propagation** — inject self-spreading payloads via comments/messages\n- **Admin compromise** — send crafted link to admin, steal session, gain full control", "title": "github - https://github.com/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "description", "text": "## Summary\n\nAVideo contains a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's `json_encode()` into a JavaScript function that renders it via `innerHTML`, bypassing encoding and achieving full script execution.\n\n\n## Root Cause\nThe vulnerability is caused by two issues working together:\n\n### 1. Source: Unescaped user input passed to JavaScript (videoNotFound.php)\n\n**File:** `view/videoNotFound.php` line 49\n\n```php\nif (!empty($_REQUEST['404ErrorMsg'])) {\n echo 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg']) . ');';\n}\n```\n\nPHP's `json_encode()` with default flags only escapes quotes (`\"` → `\\\"`) and backslashes. It does **NOT** escape HTML special characters (`<`, `>`, `/`). The resulting string contains raw HTML tags that are passed directly to JavaScript.\n\n### 2. Sink: innerHTML renders HTML tags as executable DOM (script.js)\n\n**File:** `view/js/script.js`\n\n```javascript\nfunction avideoAlertInfo(msg) { // line ~1891\n avideoAlert(\"\", msg, 'info'); // calls ↓\n}\n\nfunction avideoAlert(title, msg, type) { // line ~1270\n avideoAlertHTMLText(title, msg, type); // calls ↓\n}\n\nfunction avideoAlertHTMLText(title, msg, type) { // line ~1451\n var span = document.createElement(\"span\");\n span.innerHTML = msg; // line 1464 — XSS SINK\n swal({ content: span });\n}\n```\n\n`innerHTML` parses the string as HTML. Any ``, ``, or other HTML tags with event handlers are instantiated as real DOM elements, triggering JavaScript execution.\n\n### Data Flow\n\n```\nURL parameter (?404ErrorMsg=PAYLOAD)\n → $_REQUEST['404ErrorMsg']\n → json_encode() ← does NOT escape < > /\n → avideoAlertInfo()\n → avideoAlert()\n → avideoAlertHTMLText()\n → span.innerHTML = msg ← renders HTML tags, executes JS\n```\n\n---\n\n## Proof of Concept\n```\nhttps://localhost/view/videoNotFound.php?404ErrorMsg=\n```\n\"image\"\n\nThe page renders:\n```javascript\navideoAlertInfo(\"\");\n```\n\nWhich flows to `span.innerHTML = \"\"`. The browser creates an `` element, `src=x` fails to load, `onerror` fires `alert(document.domain)`.\n\n## Affected Code\n\n| File | Line | Issue |\n|------|------|-------|\n| `view/videoNotFound.php` | 49 | `json_encode()` does not escape `<` `>` for HTML context |\n| `view/js/script.js` | 1464 | `span.innerHTML = msg` renders user input as HTML |\n| `view/js/script.js` | 1282 | `span.innerHTML = msg` in `avideoAlertWithCookie()` |\n| `view/js/script.js` | 1335 | `span.innerHTML = __(msg,true)` in `avideoConfirm()` |\n| `view/js/script.js` | 1358 | `span.innerHTML = msg` in `avideoAlertOnceForceConfirm()` |\n\nThe `innerHTML` sink exists in 4 functions. Any future code that passes user input to `avideoAlertInfo()`, `avideoAlertWarning()`, `avideoAlertDanger()`, or `avideoAlertSuccess()` will create additional XSS vectors.\n\n\n## Remediation\n\n### Fix 1: Escape HTML in PHP (source fix)\n\n```php\n// view/videoNotFound.php line 49\n// BEFORE (vulnerable):\necho 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg']) . ');';\n\n// AFTER (fixed):\necho 'avideoAlertInfo(' . json_encode($_REQUEST['404ErrorMsg'], JSON_HEX_TAG | JSON_HEX_AMP) . ');';\n```\n\n`JSON_HEX_TAG` converts `<` → `\\u003C` and `>` → `\\u003E`, preventing HTML injection.\n\n### Fix 2: Use textContent instead of innerHTML (sink fix, recommended)\n\n```javascript\n// view/js/script.js - all alert functions\n// BEFORE (vulnerable):\nspan.innerHTML = msg;\n\n// AFTER (fixed):\nspan.textContent = msg;\n```\n\n`textContent` treats the string as plain text — HTML tags are displayed literally, never parsed or executed.\n\n### Fix 3: Add Content-Security-Policy header (defense in depth)\n\n```\nContent-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'\n```\n\n## Impact\n\n- **Session hijacking** — steal `PHPSESSID` cookie (not HttpOnly by default)\n- **Account takeover** — use stolen session to change password or email\n- **Phishing** — inject a realistic login form inside the SweetAlert modal\n- **Worm propagation** — inject self-spreading payloads via comments/messages\n- **Admin compromise** — send crafted link to admin, steal session, gain full control", "title": "github - https://api.github.com/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "description", "text": "WWBN AVideo is an open source video platform. In versions 25.0 and below, there is a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's json_encode() into a JavaScript function that renders it via innerHTML, bypassing encoding and achieving full script execution. The vulnerability is caused by two issues working together: unescaped user input passed to JavaScript (videoNotFound.php), and innerHTML rendering HTML tags as executable DOM (script.js). The attack can be escalated to steal session cookies, take over accounts, phish credentials via injected login forms, spread self-propagating payloads, and compromise admin accounts — all by exploiting the lack of proper input sanitization and cookie security (e.g., missing HttpOnly flag on PHPSESSID). The issue has been fixed in version 26.0.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33035.json" }, { "category": "description", "text": "WWBN AVideo is an open source video platform. In versions 25.0 and below, there is a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's json_encode() into a JavaScript function that renders it via innerHTML, bypassing encoding and achieving full script execution. The vulnerability is caused by two issues working together: unescaped user input passed to JavaScript (videoNotFound.php), and innerHTML rendering HTML tags as executable DOM (script.js). The attack can be escalated to steal session cookies, take over accounts, phish credentials via injected login forms, spread self-propagating payloads, and compromise admin accounts — all by exploiting the lack of proper input sanitization and cookie security (e.g., missing HttpOnly flag on PHPSESSID). The issue has been fixed in version 26.0.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33035" }, { "category": "other", "text": "0.00065", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N", "title": "CVSSV4" }, { "category": "other", "text": "5.3", "title": "CVSSV4 base score" }, { "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-5874460" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33035.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33035" }, { "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/WWBN/AVideo/security/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/WWBN/AVideo/commit/cca6196f4072cb9acc39b1030fb8fb1702b4f69b" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-wfq5-qgqp-hvhv" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33035" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5874460" ] } ], "title": "CVE-2026-33035" } ] }