CVE-2026-78174 PUBLISHED

WatchGuard Dimension Session Hijack via Exposed Session Tokens in Diagnostic Logs

Assigner: WatchGuard
Reserved: 23.08.2026 Published: 27.08.2026 Updated: 27.08.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	WatchGuard
Product	Dimension
Versions	Default: unaffected affected from 2.0 to 2.3.1 (excl.)

Exploits

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solutions

Dimension 2.3.1

Credits

Simone Paganessi (https://www.linkedin.com/in/simonepaganessi) finder

References

https://psirt.watchguard.com/CVE-2026-78174

Problem Types

CWE-200 CWE
CWE-269 CWE
CWE-532 CWE