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WatchGuard Dimension CVE-2026-78174

| EUVDEUVD-2026-67345 CRITICAL
Information Exposure (CWE-200)
2026-08-27 WatchGuard GHSA-8xpm-cmp9-mq75
9.3
CVSS 4.0 · Vendor: WatchGuard
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Vendor (WatchGuard) PRIMARY
9.3 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.6 CRITICAL

Requires an existing low-privileged admin account so PR:L and AC:L; token theft crosses into the Super Admin authority (S:C) yielding high confidentiality and integrity, with no availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:N/SA:N

Primary rating from Vendor (WatchGuard).

CVSS VectorVendor: WatchGuard

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 28, 2026 - 04:16 EUVD
Analysis Generated
Aug 28, 2026 - 02:37 vuln.today
CVE Published
Aug 27, 2026 - 23:26 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

AnalysisAI

Privilege escalation to account takeover in WatchGuard Dimension allows a low-privileged Dimension Administrator to hijack a Super Administrator account by harvesting that user's session token from a diagnostic log in the web UI. Because session identifiers are written unredacted, any authenticated administrator who can read the diagnostic log can impersonate a Super Administrator while that user is logged in, gaining full control of the management platform. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated low-privileged Dimension Administrator account with the ability to retrieve the web UI diagnostic log (PR:L), and it succeeds only while a Super Administrator is concurrently logged in, because the harvested artifact is that admin's live session token. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine high-priority issue, not an inflated CVSS number. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Patch available per WatchGuard PSIRT advisory (https://psirt.watchguard.com/CVE-2026-78174); apply the fixed Dimension build listed there as soon as it is validated - an exact fixed version was not included in the provided data and should be taken from the advisory rather than assumed. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Restrict diagnostic log access in Dimension to Super Administrators only; audit current admin account assignments and disable any unnecessary administrative accounts; enable detailed audit logging for all diagnostic log access attempts. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Dimension versions 3.4.11 and earlier are affected by an Untrusted Search Path vulnerability that could lead to arbitrar

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Dimension versions 3.4.11 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrar

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CVE-2026-78174 vulnerability details – vuln.today

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