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Mozilla Firefox CVE-2026-74985

| EUVDEUVD-2026-60697 CRITICAL
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-8j6x-f7qj-g59h
Privilege Escalation Mozilla
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

Sources disagree (Low–Critical)
Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Privilege escalation in a locally-enforced policy component implies a local, low-privileged actor (AV:L/PR:L) rather than the input's remote unauthenticated vector, with high C/I/A from full privilege gain.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Aug 20, 2026 - 18:31 vuln.today
CVSS changed
Aug 20, 2026 - 18:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 18, 2026 - 12:23 cve.org
CRITICAL 9.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

AnalysisAI

Privilege escalation in Mozilla Firefox's Enterprise Policies component allows an attacker to gain elevated privileges by subverting administrator-defined policy enforcement, affecting Firefox before 154 and Firefox ESR before 153.1. Mozilla (the reporter) assigned CWE-269 (Improper Privilege Management) and the record carries a CVSS 9.8 rating, though the low EPSS score (0.15%, 5th percentile) signals minimal predicted exploitation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain access to managed Firefox context
Delivery
Interact with Enterprise Policies component
Exploit
Trigger improper privilege management flaw
Execution
Escalate beyond policy-enforced restrictions
Impact
Gain elevated browser control
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Vulnerability AssessmentAI

Exploitation The vulnerability resides specifically in Firefox's Enterprise Policies component, so exploitation is most relevant to deployments that actually use enterprise policy management (policies.json / GPO / MDM), and the escalation targets the privilege boundary those policies enforce. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals conflict and warrant caution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario In an enterprise Firefox deployment governed by Enterprise Policies, an attacker with limited access to the endpoint or browser context abuses the improper privilege handling in the policy component to escalate to privileges the organization's policies were meant to withhold, loosening security restrictions or gaining fuller control of the browser. No public exploit is identified at time of analysis; the published CVSS AC:L suggests that, once the required access is obtained, the technique itself is low-complexity.
Remediation Upgrade to Firefox 154 or Firefox ESR 153.1, which contain the fix (Vendor-released patch: Firefox 154 / Firefox ESR 153.1); consult the Mozilla advisories at https://www.mozilla.org/security/advisories/mfsa2026-74/, mfsa2026-77, mfsa2026-78, and mfsa2026-80 for the exact channel matching your deployment, plus the Bugzilla entry https://bugzilla.mozilla.org/show_bug.cgi?id=2059825. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours: Catalog all Firefox enterprise deployments and identify systems relying on enterprise policies for security controls. …

Sign in for detailed remediation steps and compensating controls.

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

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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CVE-2026-74985 vulnerability details – vuln.today
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