CVE-2026-86188: AVideo YPTSocket Plugin Unauthenticated Cross-Site Scripting

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-05 · updated 2026-09-08
Weakness: CWE-79

Description

AVideo with YPTSocket plugin enabled contains a cross-site scripting vulnerability allowing unauthenticated attackers to execute arbitrary JavaScript in other users' browsers via the websocket callback mechanism. Attackers can send crafted socket messages with callback names resolving to global functions like avideoConfirmHTML that accept untrusted data and assign it to innerHTML, achieving script execution in the victim's origin without authentication or user interaction.

Affected products

WWBN AVideo: through 29.0

References

https://github.com/WWBN/AVideo/security/advisories/GHSA-xpx7-h2x7-59qq
https://www.vulncheck.com/advisories/avideo-yptsocket-plugin-unauthenticated-cross-site-scripting
https://github.com/WWBN/AVideo/security/advisories/GHSA-xpx7-h2x7-59qq

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