CVE-2026-40909
WWBN AVideo is an open source video platform. In versions 29.0 and prior, the locale save endpoint (`locale/save.php`) constructs a file path by directly concatenating `$_POST['flag']` into the path at line 30 without any sanitization. The `$_POST['code']` parameter is then written verbatim to that path via `fwrite()` at line 40. An admin attacker (or any user who can CSRF an admin, since no CSRF token is checked and cookies use `SameSite=None`) can traverse out of the `locale/` directory and write arbitrary `.php` files to any writable location on the filesystem, achieving Remote Code Execution. Commit 57f89ffbc27d37c9d9dd727212334846e78ac21a fixes the issue.
- Score
- CVSS 3.1 8.7 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-04-21
- Last modified
- 2026-10-26
- Weaknesses
- CWE-22
Affected products
References
- https://github.com/WWBN/AVideo/security/advisories/GHSA-6rc6-p838-686f
- https://github.com/WWBN/AVideo/commit/57f89ffbc27d37c9d9dd727212334846e78ac21a
