Advisoriesby IbisWatchGuard TechnologiesCVE-2026-13377
WatchGuard Technologies Fireware OS: cross-site scripting
Fix: upgrade to 12.11.9 or later (4 fixed versions below)
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| Fireware OS Product | >= 12.0, < 12.11.9 | 12.11.9 |
| >= 2025.1, < 2026.2.1 | 2026.2.1 | |
| >= 12.0, < 12.12.1 | 12.12.1 | |
| >= 12.0, < 12.5.19 | 12.5.19 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-79