CVE-2026-88866
Deferred Deferred - Pending Action

Stored XSS in WWBN AVideo LoginControl Plugin

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: VulnCheck

Description
WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the LoginControl plugin that fails to encode the User-Agent header before storing it in login history. Attackers with any valid login account can inject malicious scripts in the User-Agent header that execute in administrator browsers when viewing the Login History page, allowing script execution within the administrator session.

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Meta Information

Published
2026-09-10
Last Modified
2026-09-10
Generated
2026-09-10
AI Q&A
2026-09-10
EPSS Evaluated
N/A
NVD
CVE-2026-88866
EUVD
EUVD-2026-75416

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wwbn avideo to c3edcc274c389816d434acadac07ee78eaf330c1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

CVE-2026-88866 is a stored cross-site scripting (XSS) vulnerability in WWBN AVideo's LoginControl plugin. It occurs because the User-Agent header from login requests is stored without proper encoding in the login history. When an administrator views this history, the raw User-Agent is rendered as HTML, executing any malicious scripts embedded in it.

Detection Guidance

Check AVideo login history for suspicious User-Agent headers containing script tags or unusual characters. Inspect network traffic for login requests with malformed User-Agent headers. Review admin panel access logs for unauthorized actions following login events.

Impact Analysis

Attackers with valid login credentials can inject malicious scripts via the User-Agent header. When an administrator views the login history, the script executes in their session, potentially allowing the attacker to perform actions on behalf of the admin, such as accessing sensitive data or modifying settings.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. It may result in data breaches, unauthorized modifications, or disclosure of protected information, potentially leading to legal and regulatory penalties.

Mitigation Strategies

Disable the LoginControl plugin if not essential. Sanitize User-Agent headers before storage by implementing input validation. Configure the DataTable to render User-Agent as plain text instead of HTML. Monitor login history for unauthorized script injections.

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