Firebox and Fireware OS
CVE-2026-4315: WatchGuard Firebox Cross-Site Request Forgery (CSRF) in Fireware Web UI
A Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote attacker to trigger a denial-of-service (DoS) condition in the Fireware Web UI by convincing an authenticated administrator into visiting a malicious web page.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Fireware OS (Default) 2025.1 | 2026.2 or later |
| Fireware OS (Default) 12.0 | 12.12 or later |
| Fireware OS (Default) 11.8 to 11.12.4+541730 | Upgrade past 11.12.4+541730; see the advisory |
| Fireware OS (EUCC) 12.0 | 12.11.9 or later |
| Fireware OS (T15/T35) 12.0 | 12.5.18 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote attacker to trigger a denial-of-service (DoS) condition in the Fireware Web UI by convincing an authenticated administrator into visiting a malicious web page.
Exploitation
WatchGuard is not aware of any exploitation of this issue in the wild.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.