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🛡️ CVE-2026-33500

🟡 CVSS 5.4 — Medium ⚠️ Exploit Public CWE-79 NVD

5.4

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

WWBN AVideo is an open source video platform. In versions up to and including 26.0, the fix for CVE-2026-27568 (GHSA-rcqw-6466-3mv7) introduced a custom `ParsedownSafeWithLinks` class that sanitizes raw HTML `` and `` tags in comments, but explicitly disables Parsedown's `safeMode`. This creates a bypass: markdown link syntax `[text](javascript:alert(1))` is processed by Parsedown's `inlineLink()` method, which does not go through the custom `sanitizeATag()` sanitization (that only handles raw HTML tags). With `safeMode` disabled, Parsedown's built-in `javascript:` URI filtering (`sanitiseElement()`/`filterUnsafeUrlInAttribute()`) is also inactive. An attacker can inject stored XSS via comment markdown links. Commit 3ae02fa240939dbefc5949d64f05790fd25d728d contains a patch.

Details

Severity MEDIUM

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Public Exploit ⚠️ Yes

Source NVD

Published 2026-03-23

Updated 2026-06-02

Modified 2026-03-24

Fix URL https://github.com/WWBN/AVideo/commit/3ae02fa240939dbefc5949d64f05790fd25d728d

Affected Packages

Software	From version	Fixed in
avideo	—	26.0
wwbn/avideo	—	—

References

Patch https://github.com/WWBN/AVideo/commit/3ae02fa240939dbefc5949d64f05790fd25d728d

Exploit, Mitigation, Vendor Advisory https://github.com/WWBN/AVideo/security/advisories/GHSA-72h5-39r7-r26j

🔗 NVD 🔗 Mitre ✅ Fix / Advisory

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