CVE-2026-13377

VendorwatchguardProductfirewareDiscoveredJul 3, 2026UpdatedOct 25, 2026

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.

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CVSS v3.1

4.8 MEDIUM

EPSS

0.27%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Aug 16, 2026 → Aug 26, 2026

▲ 0.10pp

0.17% → 0.27% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredHIGH

User InteractionREQUIRED

ScopeCHANGED

ConfidentialityLOW

IntegrityLOW

AvailabilityNONE

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Connections

2 relationships

CWE-79

source

Timeline

disclosure → media coverage

Jul 3, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 25, 2026