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Mozilla Firefox EUVDEUVD-2026-60680

| CVE-2026-74952 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-85g2-phqx-wgj2
Privilege Escalation Mozilla
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
9.6 CRITICAL

S:C assigned independently because the Application Update component on Windows invokes a SYSTEM-privileged service, constituting a scope change beyond the browser process.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 16:33 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 8.8

DescriptionCVE.org

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154.

Articles & Coverage 1

News 12 New Mozilla Vulnerabilities - 12 High Severity, No POC Available Aug 18, 2026

AnalysisAI

Privilege escalation via the Application Update component in Mozilla Firefox allows a network-adjacent attacker, with user interaction, to gain elevated privileges with high impact to confidentiality, integrity, and availability. All Firefox versions prior to 154 are affected per Mozilla CPE data. No public exploit code or CISA KEV listing has been identified at time of analysis, though the CVSS score of 8.8 and the nature of the update mechanism - which on some platforms (e.g., Windows via the Mozilla Maintenance Service) operates with system-level privileges - make this a meaningful escalation risk.

Technical ContextAI

CWE-269 (Improper Privilege Management) identifies the root cause as a failure to correctly restrict or manage privilege levels during a sensitive operation. The affected component is Firefox's Application Update subsystem, which is responsible for downloading, verifying, and applying browser updates. On Windows, this component interacts with the Mozilla Maintenance Service, a system-privileged helper process. On other platforms, the updater may still handle privileged file writes to installation directories. Improper privilege management in this context typically means that a lower-privileged code path can invoke or influence a higher-privileged operation without adequate controls. Affected products per CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* cover all Firefox versions across all platforms prior to the 154 release.

RemediationAI

Upgrade Mozilla Firefox to version 154 or later, which contains the vendor-released fix as confirmed by Mozilla Security Advisory mfsa2026-74 (https://www.mozilla.org/security/advisories/mfsa2026-74/). Organizations using managed browser deployments should push the update via their endpoint management tooling immediately. Where immediate upgrade is not feasible, a specific compensating control for the update component vector is to disable automatic update checks and block outbound connections from the Firefox process to Mozilla update endpoints (update.mozilla.org, aus5.mozilla.org) - this reduces exposure but also prevents receipt of future security patches, which is a significant trade-off. On Windows, disabling the Mozilla Maintenance Service via Group Policy or services.msc removes the highest-privilege attack surface but will prevent silent background updates. Monitor Bugzilla report https://bugzilla.mozilla.org/show_bug.cgi?id=2021757 for additional technical detail on the precise attack surface.

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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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EUVD-2026-60680 vulnerability details – vuln.today
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