High severity · published Sep 10, 2026
CVE-2026-88866
WWBN AVideo LoginControl Stored XSS via User-Agent Header
8.7
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AV
AVideo · WWBN
through c3edcc274c389816d434acadac07ee78eaf330c1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88866
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88866
github.com
https://github.com/WWBN/AVideo/security/advisories/GHSA-wg67-62q3-2m33
www.vulncheck.com
https://www.vulncheck.com/advisories/wwbn-avideo-logincontrol-stored-xss-via-user-agent-header
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