Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Watchguard | Fireware | >= 12.0, < 12.12.1 |
| Watchguard | Firebox M270 | - |
| Watchguard | Firebox M290 | - |
| Watchguard | Firebox M370 | - |
| Watchguard | Firebox M390 | - |
| Watchguard | Firebox M440 | - |
| Watchguard | Firebox M4600 | - |
| Watchguard | Firebox M470 | - |
| Watchguard | Firebox M4800 | - |
| Watchguard | Firebox M5600 | - |
| Watchguard | Firebox M570 | - |
| Watchguard | Firebox M5800 | - |
| Watchguard | Firebox M590 | - |
| Watchguard | Firebox M670 | - |
| Watchguard | Firebox M690 | - |
| Watchguard | Firebox Nv5 | - |
| Watchguard | Firebox T20 | - |
| Watchguard | Firebox T25 | - |
| Watchguard | Firebox T40 | - |
| Watchguard | Firebox T45 | - |
Related Weaknesses (CWE)
References
- https://psirt.watchguard.com/CVE-2026-13377
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00019Vendor Advisory
FAQ
What is CVE-2026-13377?
CVE-2026-13377 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 additio...
How severe is CVE-2026-13377?
CVE-2026-13377 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-13377?
Check the references section above for vendor advisories and patch information. Affected products include: Watchguard Fireware, Watchguard Firebox M270, Watchguard Firebox M290, Watchguard Firebox M370, Watchguard Firebox M390.