Staging Environment: Content and features may be unstable or change without notice.
Advisory details: vulnrichment / CVE-2026-40911
Advisory ID vulnrichment/CVE-2026-40911
Aliases
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-94 Improper Control of Generation of Code ('Code Injection')
System Score Found at
cvssv3.1 10
ssvc Track*
Reference id Reference type URL
https://github.com/WWBN/AVideo/commit/c08694bf6264eb4decceb78c711baee2609b4efd
https://github.com/WWBN/AVideo/security/advisories/GHSA-gph2-j4c9-vhhr
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at None
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-04-22T13:21:59Z/ Found at None

Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-04-22T13:21:59Z/

Decision: Track*

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/40xxx/CVE-2026-40911.json

Source Advisory: vulnrichment/CVE-2026-40911

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]