Critical severity · published Aug 27, 2026
CVE-2026-78174
WatchGuard Dimension Session Hijack via Exposed Session Tokens in Diagnostic Logs
9.3
CVSS
0.4%
EPSS
No
On KEV
Description
WatchGuard Dimension records unredacted session identifiers for logged-in users in its web UI diagnostic log. A low-privileged Dimension Administrator can retrieve this log and extract a Super Administrator's session token while that administrator is logged in, enabling account takeover.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% 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-2026-78174
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78174
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2026-78174
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