CVE-2026-40911

Description

WWBN AVideo is an open source video platform. In versions 29.0 and prior, the YPTSocket plugin's WebSocket server relays attacker-supplied JSON message bodies to every connected client without sanitizing the `msg` or `callback` fields. On the client side, `plugin/YPTSocket/script.js` contains two `eval()` sinks fed directly by those relayed fields (`json.msg.autoEvalCodeOnHTML` at line 568 and `json.callback` at line 95). Because tokens are minted for anonymous visitors and never revalidated beyond decryption, an unauthenticated attacker can broadcast arbitrary JavaScript that executes in the origin of every currently-connected user (including administrators), resulting in universal account takeover, session theft, and privileged action execution. Commit c08694bf6264eb4decceb78c711baee2609b4efd contains a fix.

CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0029

Probability of exploitation

0.52%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-94 CWE-94

Affected Products

Vendor	Product	Versions
wwbn	avideo	< 29.0

References

Advisories & Patches

https://github.com/WWBN/AVideo/commit/c08694bf6264eb4decceb78c711baee2609b4efd https://github.com/WWBN/AVideo/security/advisories/GHSA-gph2-j4c9-vhhr https://github.com/WWBN/AVideo/security/advisories/GHSA-gph2-j4c9-vhhr

Exploits

https://github.com/WWBN/AVideo/security/advisories/GHSA-gph2-j4c9-vhhr https://github.com/WWBN/AVideo/security/advisories/GHSA-gph2-j4c9-vhhr

Frequently Asked Questions

What is CVE-2026-40911? +

WWBN AVideo is an open source video platform. In versions 29.0 and prior, the YPTSocket plugin's WebSocket server relays attacker-supplied JSON message bodies to every connected client without sanitizing the `msg` or `callback` fields. On the client side, `plugin/YPTSocket/script.js` contains two `eval()` sinks fed directly by those relayed fields (`json.msg.autoEvalCodeOnHTML` at line 568 and `json.callback` at line 95). Because tokens are minted for anonymous visitors and never revalidated beyond decryption, an unauthenticated attacker can broadcast arbitrary JavaScript that executes in the origin of every currently-connected user (including administrators), resulting in universal account takeover, session theft, and privileged action execution. Commit c08694bf6264eb4decceb78c711baee2609b4efd contains a fix. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-40911? +

CVE-2026-40911 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0029, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-40911? +

CVE-2026-40911 affects products from wwbn, specifically: avideo. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40911? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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