CVE-2026-78617: WatchGuard Dimension Web UI Authentication Brute-Force Due to Missing Rate Limiting

Severity: medium (CVSS 6.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-08-28
Weakness: CWE-203

Description

WatchGuard Dimension's web login endpoint does not enforce effective rate-limiting or account lockout by default allowing a remote attacker to perform automated password guessing against user accounts. If the account lockout setting is enabled, brute-force attempts are blocked after a defined number of failed attempts, but this setting is not enabled by default.

Affected products

WatchGuard Dimension: from 2.0 before 2.3.1 — fixed in 2.3.1

How to fix

Upgrade to a fixed version: WatchGuard Dimension 2.3.1. Check the vendor advisory for mitigations.

References

https://psirt.watchguard.com/CVE-2026-78617

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