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Firefox CVE-2026-6769

| EUVDEUVD-2026-24110 HIGH
Improper Privilege Management (CWE-269)
2026-04-21 mozilla GHSA-35h9-jh69-pc24
Privilege Escalation Mozilla Red Hat Suse
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

10
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:35 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 21, 2026 - 21:22 vuln.today
cvss_changed
Severity Changed
Apr 21, 2026 - 21:22 NVD
MEDIUM HIGH
CVSS changed
Apr 21, 2026 - 21:22 NVD
6.5 (MEDIUM) 8.8 (HIGH)
Analysis Generated
Apr 21, 2026 - 18:24 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
6.5 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24110
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
HIGH 8.8

DescriptionCVE.org

Privilege escalation in the Debugger component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

Privilege escalation in Firefox's Debugger component allows remote attackers to gain elevated system privileges after user interaction with a malicious site. Affects Firefox versions prior to 150 and Firefox ESR versions prior to 140.10. CVSS 8.8 severity with network attack vector and no authentication required. SSVC framework indicates no active exploitation detected and non-automatable attack pattern. Vendor-released patches available in Firefox 150 and Firefox ESR 140.10 per Mozilla security advisories MFSA2026-30 through MFSA2026-34.

Technical ContextAI

This vulnerability resides in Firefox's Debugger component, which provides developer tools for inspecting and debugging web content. The CWE-269 classification indicates an improper privilege management flaw where the component fails to properly restrict elevated operations. The CPE data identifies Mozilla Firefox as the affected product across multiple branches. The Debugger component operates with elevated privileges to instrument running code, and this flaw likely allows web content to escape the browser sandbox and execute operations with higher privileges than intended. The network attack vector (AV:N) combined with the Debugger context suggests the vulnerability can be triggered remotely through crafted web content that interacts with the debugging subsystem, possibly through developer tool APIs accessible to web pages or extensions.

RemediationAI

Upgrade immediately to Firefox 150 or later for standard release channel users, or Firefox ESR 140.10 or later for Extended Support Release deployments. Vendor-released patches are confirmed available per Mozilla Security Advisories MFSA2026-30 (https://www.mozilla.org/security/advisories/mfsa2026-30/) and MFSA2026-32 (https://www.mozilla.org/security/advisories/mfsa2026-32/). Additional advisory details are available in MFSA2026-33 and MFSA2026-34 at https://www.mozilla.org/security/advisories/. If immediate patching is not feasible, implement compensating controls by disabling the Firefox Debugger and Developer Tools via enterprise policy (preference: devtools.debugger.enabled=false and devtools.chrome.enabled=false), though this will break legitimate debugging workflows for developers. Alternatively, restrict Firefox usage to trusted content only through web filtering and block access to untrusted websites, accepting the operational impact of reduced browsing functionality. Monitor endpoint detection systems for unusual privilege escalation attempts originating from Firefox processes.

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Same weakness CWE-269 – Improper Privilege Management

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CVE-2016-0151 HIGH POC
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Same technique Privilege Escalation

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CVE-2016-10372 CRITICAL POC
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10.0

Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6769 vulnerability details – vuln.today
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