Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wwbn | Avideo | <= 29.0 |
Related Weaknesses (CWE)
References
- https://github.com/WWBN/AVideo/commit/bf1c76989e6a9054be4f0eb009d68f0f2464b453Patch
- https://github.com/WWBN/AVideo/security/advisories/GHSA-hg7g-56h5-5pqrExploitMitigationVendor Advisory
- https://github.com/WWBN/AVideo/security/advisories/GHSA-hg7g-56h5-5pqrExploitMitigationVendor Advisory
FAQ
What is CVE-2026-40935?
CVE-2026-40935 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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, le...
How severe is CVE-2026-40935?
CVE-2026-40935 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40935?
Check the references section above for vendor advisories and patch information. Affected products include: Wwbn Avideo.