CVE-2026-86188: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in WWBN AVideo
Description
AVideo with the YPTSocket plugin enabled has a cross-site scripting (XSS) vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in other users' browsers. This occurs via the websocket callback mechanism where attackers send crafted messages that invoke global functions like avideoConfirmHTML, which improperly assign untrusted data to innerHTML. The vulnerability affects versions from 0 up to and including 29.0. The CVSS 4.0 score is 6.9, indicating a medium severity risk.
CVSS v4.0
Score 6.9medium
Affected software
WWBN
AVideo
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86188 is a cross-site scripting vulnerability in WWBN's AVideo product when the YPTSocket plugin is enabled. The flaw arises because websocket callback functions such as avideoConfirmHTML accept untrusted input and assign it directly to innerHTML without proper neutralization. This allows unauthenticated attackers to send specially crafted socket messages that execute arbitrary JavaScript in the context of other users' browsers, without requiring user interaction. The vulnerability affects all versions from 0 through 29.0 inclusive.
Potential Impact
An attacker can execute arbitrary JavaScript code in the browsers of other users without authentication or user interaction. This can lead to session hijacking, defacement, or other malicious actions within the victim's origin. The vulnerability is rated medium severity with a CVSS 4.0 score of 6.9, reflecting the network attack vector, low complexity, no privileges or user interaction required, but with some scope and integrity impacts.
Mitigation Recommendations
No vendor advisory or patch information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling the YPTSocket plugin or restricting websocket message handling to trusted sources if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-05T11:51:31.101Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9c0d20acd9273b49d97133
Added to database: 09/05/2026, 12:37:52 UTC
Last enriched: 09/15/2026, 01:12:14 UTC
Last updated: 10/19/2026, 06:48:20 UTC
Views: 78
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