Skip to main content

Mozilla Firefox EUVDEUVD-2026-60678

| CVE-2026-74950 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
Share

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.

More in Mozilla

View all
CVE-2015-4495 HIGH POC
8.8 Aug 08

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote
CVE-2013-1690 HIGH POC
8.8 Jun 26

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before

CVE-2013-0758 CRITICAL POC
9.3 Jan 13

Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderb
CVE-2013-0753 CRITICAL POC
9.3 Jan 13

Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox b
CVE-2012-3993 CRITICAL POC
9.3 Oct 10

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbi
CVE-2013-1710 CRITICAL POC
10.0 Aug 07

The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird befo
CVE-2017-3823 HIGH POC
8.8 Feb 01

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Conta
CVE-2014-8636 HIGH POC
7.5 Jan 14

The XrayWrapper implementation in Mozilla Firefox before 35.0 and SeaMonkey before 2.32 does not properly interact with

CVE-2013-0757 CRITICAL POC
9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi
CVE-2014-1510 CRITICAL POC
9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se
CVE-2014-1511 CRITICAL POC
9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo
CVE-2013-0643 HIGH
8.8 Feb 27

The Firefox sandbox in Adobe Flash Player before 10.3.183.67 and 11.x before 11.6.602.171 on Windows and Mac OS X, and b

Same weakness CWE-269 – Improper Privilege Management

View all
CVE-2017-5689 CRITICAL POC
9.8
CVE-2021-20021 CRITICAL POC
9.8
CVE-2017-12635 CRITICAL POC
9.8
CVE-2012-3993 CRITICAL POC
9.3
CVE-2017-11467 CRITICAL POC
9.8
CVE-2014-1510 CRITICAL POC
9.8
CVE-2014-1511 CRITICAL POC
9.8
CVE-2019-1405 HIGH POC
7.8

Same technique Privilege Escalation

View all
CVE-2024-0012 CRITICAL POC
9.3
CVE-2025-47812 CRITICAL POC
10.0
CVE-2013-0422 CRITICAL POC
9.8
CVE-2013-0632 CRITICAL POC
9.8
CVE-2024-9474 MEDIUM POC
6.9
CVE-2017-5689 CRITICAL POC
9.8
CVE-2021-20021 CRITICAL POC
9.8
CVE-2017-12635 CRITICAL POC
9.8

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

Share

EUVD-2026-60678 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy