Is CVE-2026-40909 actively exploited?

CVE-2026-40909 has no public evidence of in-the-wild exploitation as of 2026-04-23.

What is the CVSS score for CVE-2026-40909?

CVE-2026-40909 has a CVSS score of 8.7 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N.

How do I patch CVE-2026-40909?

Patch guidance is available from wwbn security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40909.

Fix CVE-2026-40909 - HIGH wwbn avideo

Description

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Attack Vector: network
Complexity: low
Privileges: high
User Action: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: none
Weaknesses: CWE-22 · Path Traversal

Metadata

Primary Vendor: WWBN
Published: 4/21/2026
Last Modified: 4/23/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

wwbn : avideo

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-40909. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-40909

View on NIST NVD

CVE-2026-40909 vulnerability