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Mozilla Firefox CVE-2026-74950

| EUVDEUVD-2026-60678 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-hhfp-m479-hqjj
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-reachable browser flaw requiring only user download interaction; no attacker credentials needed; high CIA impact within the browser privilege boundary.

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

4
Analysis Generated
Aug 18, 2026 - 16:30 vuln.today
CVSS changed
Aug 18, 2026 - 16:22 NVD
8.8 (HIGH)
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 Downloads API 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 Mozilla Firefox's Downloads API component exposes users on any version prior to Firefox 154 or Firefox ESR 153.1 to high-impact compromise across confidentiality, integrity, and availability. Classified under CWE-269 (Improper Privilege Management), the flaw enables an unauthenticated remote attacker to escalate privileges when a user interacts with a crafted download trigger, requiring no prior foothold on the target system. No public exploit has been identified at time of analysis, but Firefox's ubiquitous deployment and the low attack complexity make this a high-priority patch for any organization.

Technical ContextAI

The Downloads API is Firefox's internal browser interface governing file download operations, including download permissions, file access grants, and associated privilege controls within the browser process model. CWE-269 (Improper Privilege Management) identifies the root cause class as a failure to correctly assign, verify, or constrain privileges during download-related operations - potentially allowing a lower-trust content context to gain capabilities reserved for higher-privilege browser components or the browser process itself. The affected product is identified via CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* covering all Firefox versions prior to the fixed releases. Two separate Mozilla Foundation Security Advisories (MFSA2026-74 and MFSA2026-77) reference this CVE, indicating the vulnerability spans both the standard and ESR release channels, and the associated Bugzilla report (bug 1880253) is the upstream tracking issue for the root cause investigation.

RemediationAI

Upgrade Mozilla Firefox to version 154 or later for the standard release channel, and to version 153.1 or later for the ESR channel - these are the vendor-confirmed fixed versions per Mozilla's security advisories at https://www.mozilla.org/security/advisories/mfsa2026-74/ and https://www.mozilla.org/security/advisories/mfsa2026-77/. Enterprise deployments using managed browser distribution tools such as SCCM, Intune, or Puppet should prioritize pushing the update to all endpoints immediately. If immediate patching is operationally blocked, consider enforcing browser policy to disable or restrict automatic and prompted download behavior via enterprise policy configurations (e.g., Firefox's managed policies JSON or Group Policy on Windows), which would reduce attacker surface exposure through the Downloads API; note this carries usability trade-offs and is not a substitute for patching. Organizations on the ESR track specifically for stability should migrate to ESR 153.1 at minimum without waiting for the next scheduled ESR update window.

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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-2026-74950 vulnerability details – vuln.today
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