Is CVE-2026-43874 actively exploited?

No active exploitation of CVE-2026-43874 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-43874 be exploited remotely?

Yes. CVE-2026-43874 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-43874?

CVE-2026-43874 has a CVSS score of 7.2 (HIGH).

HOME VULNERABILITIESCVE-2026-43874

HIGH

CVE-2026-43874

CWE-94Published: May 11, 2026· Updated: May 12, 2026

7.2

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:17.2th

Official Description

WWBN AVideo is an open source video platform. In versions up to and including 29.0, the server-side mitigation for the YPTSocket autoEvalCodeOnHTML eval sink (from CVE-2026-40911) only strips the payload when it sits under $json['msg'], but the relay function msgToResourceId() selects the outbound message from $msg['json'] before $msg['msg']. An unauthenticated attacker can obtain a WebSocket token from plugin/YPTSocket/getWebSocket.json.php, connect to the WebSocket server, and send a message with autoEvalCodeOnHTML nested under a top-level json field — the strip branch is skipped, the relay delivers the payload verbatim to any logged-in user identified by to_users_id, and the client script runs it through eval(). Commit 9f3006f9a89a34daa67a83c6ad35f450cb91fcce contains an updated fix.

NVD Source

Technical Analysis

CVE-2026-43874 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.