CVE-2026-3987: A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged…
CVE-2026-3987 · Severity: high · CVSS 7.2 · Published 2026-04-01
A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.
No. Junglewise Threat Intelligence has no report of CVE-2026-3987 being exploited in the wild.
How severe is CVE-2026-3987?
High severity, with a CVSS score of 7.2, published 1 April 2026.
Which products and versions are affected?
Watchguard Firebox Cloud, Watchguard Firebox M270, Watchguard Firebox M290, Watchguard Firebox M295 and 33 more. The advisory does not name versions.
Is there a fix for CVE-2026-3987?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-3987?
Check whether you run Watchguard Firebox Cloud, Watchguard Firebox M270, Watchguard Firebox M290 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.