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Mozilla Firefox EUVDEUVD-2026-60756

| CVE-2026-74953 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-hggc-vx74-xwxm
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 and only user page-visit interaction; privilege escalation is scoped within the browser process with full CIA impact.

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 - 16:34 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 Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, 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 Networking: Cookies component allows a remote, unauthenticated attacker to gain elevated privileges within the browser when a user visits a malicious page, yielding full confidentiality, integrity, and availability impact. All Firefox releases prior to 154 and both ESR branches prior to 140.14 and 153.1 are affected across all platforms. SSVC rates technical impact as total, but exploitation status is confirmed as none and the attack is not automatable due to the required user interaction; no public exploit or CISA KEV listing exists at time of analysis.

Technical ContextAI

The vulnerability resides in Firefox's cookie networking subsystem and is classified under CWE-269 (Improper Privilege Management), meaning the browser fails to correctly enforce privilege boundaries when processing cookies at the network layer. Improper privilege management in this context typically involves a low-privilege execution context being granted access to resources or operations normally reserved for a higher-privilege context - here within the browser's own security model. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, indicating all Firefox builds on all platforms and architectures are affected. Three separate Mozilla security advisories (mfsa2026-74, mfsa2026-76, mfsa2026-77) were issued, suggesting the fix spans both the release and both ESR channels independently, which is consistent with a flaw in shared networking code backported across branches.

RemediationAI

Upgrade to Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1 depending on the deployed channel; these are vendor-confirmed fixed versions per Mozilla advisories mfsa2026-74, mfsa2026-76, and mfsa2026-77. Enterprise deployments using the ESR track should determine which ESR branch is in use before applying the correct update. For environments where immediate patching is not possible, restricting access to untrusted web content through network-level controls (web proxies with category filtering, DNS-based blocking of uncategorized domains) reduces exposure since the attack requires a user to visit a malicious page. Browser lockdown policies that restrict navigation to allowlisted domains are the most targeted compensating control, though these carry significant usability trade-offs in general-purpose environments. No workarounds are documented in the Mozilla advisories; patching remains the only complete remediation.

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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-2026-60756 vulnerability details – vuln.today
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