CVE-2026-57910: WatchGuard Agent improper authentication allows unauthenticated remote code execution

Severity: critical (CVSS 9.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-09-28
Weakness: CWE-306

Description

Improper authentication in the WatchGuard Agent allows an unauthenticated attacker with network access to cause the agent to execute arbitrary code with elevated privileges.

Affected products

WatchGuard Agent: before 1.17.01.0000; before 1.25.13.0000; before 1.17.21.0000 — fixed in 1.17.01.0000, 1.17.21.0000, 1.25.13.0000

How to fix

Upgrade to a fixed version: WatchGuard Agent 1.17.01.0000, 1.17.21.0000, 1.25.13.0000. Check the vendor advisory for mitigations.

References

https://psirt.watchguard.com/CVE-2026-57910

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