CVE-2026-40911

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Source
https://cve.org/CVERecord?id=CVE-2026-40911
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40911.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-40911
Aliases
Published
2026-04-21T19:55:37.195Z
Modified
2026-08-05T03:47:16.010910741Z
Severity
  • 10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
WWBN AVideo YPTSocket WebSocket Broadcast Relay Leads to Unauthenticated Cross-User JavaScript Execution via Client-Side eval() Sinks
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-94"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40911.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "last_affected": "29.0"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/wwbn/avideo

Affected ranges

Type
GIT
Repo
https://github.com/wwbn/avideo
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c08694bf6264eb4decceb78c711baee2609b4efd
Database specific 
{
    "source": "REFERENCES"
}

Affected versions

10.*
10.8
Other
11
11.*
11.1
11.1.1
11.5
11.6
12.*
12.4
14.*
14.3
14.3.1
18.*
18.0
2.*
2.2
2.7
21.*
21.0
22.*
22.0
24.*
24.0
25.*
25.0
26.*
26.0
29.*
29.0
3.*
3.4
4.*
4.0
7.*
7.2
7.3
7.4
7.6
7.7
7.8
8.*
8.1
8.5
8.6
8.7
8.9
8.9.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40911.json"