# CVE-2026-40935

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40935
- **Published:** 2026-04-21
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-804

## Affected products

- `wwbn:avideo`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40935

## Citation

> AI Analytics. CVE-2026-40935. Retrieved 2026-07-12 from https://api.ai-analytics.org/cve/CVE-2026-40935. Derived from NIST NVD. Licensed CC0.

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