CVEvulnerability
CVE-2026-40935
5.3 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-21
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-804
Description
WWBN AVideo is an open source video platform. In versions 29.0 and prior, `objects/getCaptcha.php` accepts the CAPTCHA length (`ql`) directly from the query string with no clamping or sanitization, letting any unauthenticated client force the server to generate a 1-character CAPTCHA word. Combined with a case-insensitive `strcasecmp` comparison over a ~33-character alphabet and the fact that failed validations do NOT consume the stored session token, an attacker can trivially brute-force the CAPTCHA on any endpoint that relies on `Captcha::validation()` (user registration, password recovery, contact form, etc.) in at most ~33 requests per session. Commit bf1c76989e6a9054be4f0eb009d68f0f2464b453 contains a fix.
Affected configurations
• wwbn avideo (<= 29.0)
Related
Weakness · CWE (1)
- CWE-804 Guessable CAPTCHA weakness
References
- https://github.com/WWBN/AVideo/commit/bf1c76989e6a9054be4f0eb009d68f0f2464b453 Patch
- https://github.com/WWBN/AVideo/security/advisories/GHSA-hg7g-56h5-5pqr Exploit, Mitigation, Vendor Advisory
- https://github.com/WWBN/AVideo/security/advisories/GHSA-hg7g-56h5-5pqr Exploit, Mitigation, Vendor Advisory