Is CVE-2026-40909 actively exploited?

No active exploitation of CVE-2026-40909 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40909 be exploited remotely?

Yes. CVE-2026-40909 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2026-40909 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-40909

CWE-22Published: April 21, 2026· Updated: Apr 23, 2026

6.5

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:27.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40909 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 6.5.