Medium severity · published Aug 27, 2026
CVE-2026-78617
WatchGuard Dimension Web UI Authentication Brute-Force Due to Missing Rate Limiting
6.3
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
Dimension · WatchGuard
2.0 before 2.3.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78617
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78617
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2026-78617
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