XSS in Wwbn Avideo
CVE-2026-86188
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/WWBN/AVideo/security/advisories/GHSA-xpx7-h2x7-59qq (vendor-advisory)
- www.vulncheck.com/advisories/avideo-yptsocket-plugin-unauthenticated-cross-site… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86188?
- CVE-2026-86188 is a high-severity vulnerability in Wwbn Avideo, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-09-05.
- How severe is CVE-2026-86188?
- High severity. CVSS v3 base score is 7.2 out of 10.