The authentication applet in Watchguard Fireware 11.11 Operating System has reflected XSS (this can also cause an open redirect).

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• watchguard firewareup to 11.11 inclusive

Other highest-scoring records for the same primary product.

• CVE-2025-9242WatchGuard Firebox iked Out of Bounds Write VulnerabilityKEV
  94Now
• CVE-2022-26318On WatchGuard Firebox and XTM appliances, an unauthenticated user can execute arbitrary code, aka FBX-22786.KEV
  92Now
• CVE-2025-14733WatchGuard Firebox iked Out of Bounds Write VulnerabilityKEV
  75This week
• CVE-2022-23176WatchGuard Firebox and XTM appliances allow a remote attacker with unprivileged credentials to access the system with a privileged managemenKEV
  68This week
• CVE-2013-6021Buffer overflow in WGagent in WatchGuard WSM and Fireware before 11.8 allows remote attackers to execute arbitrary code via a long sessionid
  41Plan
• CVE-2022-31789An integer overflow in WatchGuard Firebox and XTM appliances allows an unauthenticated remote attacker to trigger a buffer overflow and pote
  40Plan

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1commentEl.innerHTML = comment.body;

1commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.