CVE-2026-78617 WatchGuard Dimension Web UI Authentication Brute-Force Due to Missing Rate Limiting
Remote attackers can brute-force user accounts on WatchGuard Dimension due to missing default rate limiting, requiring configuration changes to enable account lockout.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78617?
CVE-2026-78617 is a medium-severity authentication bypass vulnerability in WatchGuard Dimension, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-78617?
How do I fix CVE-2026-78617?
No fix has been published for CVE-2026-78617 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-78617 being exploited?
There is no known exploitation of CVE-2026-78617 in the wild and no public exploit code.
Sources
Also known as GHSA-3x89-jjqx-2x3q.