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.

CVSS v3 8.7 HIGH

8.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.3 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/WWBN/AVideo/commit/57f89ffbc27d37c9d9dd727212334846e78ac21a	Patch
https://github.com/WWBN/AVideo/security/advisories/GHSA-6rc6-p838-686f	Exploit Vendor Advisory
https://github.com/WWBN/AVideo/security/advisories/GHSA-6rc6-p838-686f	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-21 20:17

Updated : 2026-06-17 10:45

NVD link : CVE-2026-40909

Mitre link : CVE-2026-40909

CVE.ORG link : CVE-2026-40909

JSON object : View

Products Affected

wwbn

avideo

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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