Medium severity4.8NVD Advisory· Published Jul 3, 2026· Updated Aug 28, 2026

CVE-2026-13377

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

WatchGuard/Fireware2 versions
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*range: >=12.0,<12.12.1
- (no CPE)
WatchGuard/Fireware OS SIP Proxyllm-fuzzy

Patches

Vulnerability mechanics

References

www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00019nvdVendor Advisory
psirt.watchguard.com/CVE-2026-13377nvd

News mentions

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cvss	0.312
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000