CVE-2026-86188 AVideo YPTSocket Plugin Unauthenticated Cross-Site Scripting
Unauthenticated attackers can execute arbitrary JavaScript in victims' browsers via the YPTSocket plugin's websocket callback mechanism in AVideo.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86188?
CVE-2026-86188 is a medium-severity cross-site scripting vulnerability in WWBN AVideo, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-86188?
How do I fix CVE-2026-86188?
No fix has been published for CVE-2026-86188 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-86188 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86188 exists.
Sources
Also known as GHSA-jjf2-9w5j-xm7r, GHSA-xpx7-h2x7-59qq.