Vulnerability · Published Aug 27, 2026 · Assigned by WatchGuard
CVE-2026-78174WatchGuard Dimension Session Hijack via Exposed Session Tokens in Diagnostic Logs
Critical 9.3
In plain English
A critical-severity information exposure 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 37% of all known vulnerabilities).
Severity (CVSS 4.0)9.3Critical
Exploit odds (30 days)0.4%top 62.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WatchGuard | Dimension | 2.0 – before 2.3.1 |
Weakness: CWE-200, CWE-269, CWE-532 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:N/SA:N
References
- https://psirt.watchguard.com/CVE-2026-78174 vendor-advisory