Vulnerability · Published Aug 27, 2026 · Assigned by WatchGuard

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

Medium 6.3

In plain English

A medium-severity security flaw in Dimension from WatchGuard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.4%top 63.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
WatchGuard	Dimension	2.0 – before 2.3.1

Weakness: CWE-203, CWE-307 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References

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