CVE-2026-13377 — WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration

CVE-2026-13377

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration PUBLISHED

Description (CNA)

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS SIP Proxy module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-6947.

Affected (CNA)

Vendor / product	Versions
WatchGuard / Fireware OS	affected 12.0 before 12.11.9
WatchGuard / Fireware OS	affected 2025.1 before 2026.2.1; affected 12.0 before 12.12.1
WatchGuard / Fireware OS	affected 12.0 before 12.5.19

CWE

CWE-79

References

https://psirt.watchguard.com/CVE-2026-13377
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00019

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.