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Mozilla Firefox EUVDEUVD-2026-60682

| CVE-2026-74955 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-h83v-xrj2-hcmq
Privilege Escalation Red Hat Mozilla Suse
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
8.8 HIGH

Network-delivered browser attack requires no attacker privileges; UI:R confirmed mandatory; S:U as no evidence of sandbox escape or scope change to subsequent systems.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/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:N/SI:N/SA:N
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 - 15:57 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 Request Handling component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

Articles & Coverage 1

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

AnalysisAI

Privilege escalation in Firefox's Request Handling component exposes all versions prior to 154 (and ESR prior to 153.1) to high-impact compromise of confidentiality, integrity, and availability. The flaw carries a CVSS 8.8 score with a network attack vector and no privilege prerequisite, meaning a remote attacker can trigger it by inducing a user to interact with attacker-controlled content. SSVC assessment confirms no active exploitation at time of analysis and rates technical impact as total, while fix versions are confirmed via two Mozilla security advisories.

Technical ContextAI

CWE-269 (Improper Privilege Management) identifies the root cause as a failure to correctly enforce privilege boundaries within a software component. In Firefox, the Request Handling component is responsible for processing browser requests - likely network or IPC-layer operations - where privilege context transitions must be tightly controlled. Improper management here can allow a lower-privileged execution context to acquire elevated capabilities it was not intended to hold. The affected CPE (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) covers all Firefox product variants across all platforms. The CVSS vector (AV:N/AC:L/PR:N/UI:R/S:U) indicates the attack is network-delivered, low complexity, requires no attacker-side privileges, but does require user interaction - consistent with a browser-based attack surface where a victim must visit or interact with malicious content.

RemediationAI

The primary fix is to upgrade to Firefox 154 or Firefox ESR 153.1, both confirmed as patched releases per Mozilla advisories mfsa2026-74 and mfsa2026-77 (https://www.mozilla.org/security/advisories/mfsa2026-74/, https://www.mozilla.org/security/advisories/mfsa2026-77/). Enterprise environments managing Firefox via policy should prioritize distribution of these versions through their software management tooling. As a compensating control prior to patching, organizations may consider restricting access to untrusted external websites via web proxy allowlisting, though this significantly degrades browser utility and does not constitute a true fix. Because UI:R is required, user security awareness around visiting unknown URLs offers marginal but non-zero risk reduction in the interim.

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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-2026-60682 vulnerability details – vuln.today
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