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Firefox CVE-2026-6761

| EUVDEUVD-2026-24102 HIGH
Improper Privilege Management (CWE-269)
2026-04-21 mozilla GHSA-5mff-cxq5-82jv
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 - 00:37 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-2026-24102
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
HIGH 8.8

DescriptionCVE.org

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

AnalysisAI

Remote attackers can escalate privileges in Firefox and Firefox ESR through a flaw in the Networking component when a user interacts with malicious content. The vulnerability affects Firefox versions prior to 150 and Firefox ESR versions prior to 140.10, allowing attackers with no initial privileges to achieve high impact on confidentiality, integrity, and availability. Mozilla has released patches for both product lines. EPSS data not available; no confirmed active exploitation (not listed in CISA KEV); public exploit code status unknown.

Technical ContextAI

This vulnerability resides in Firefox's Networking component, which handles network protocols, connections, and data transmission. Classified as CWE-269 (Improper Privilege Management), the flaw allows code or operations to execute with elevated privileges beyond what should be permitted. The Networking component typically operates with restricted privileges to sandbox web content, but this vulnerability breaks that security boundary. The CPE identifier confirms Mozilla Firefox as the affected product across all platforms where Firefox runs. The high CVSS score (8.8) reflects that successful exploitation grants attackers the same level of access to confidentiality, integrity, and availability as a legitimate privileged user would have within the browser context.

RemediationAI

Upgrade to Firefox version 150 or later for standard release channel users, or Firefox ESR version 140.10 or later for organizations using the Extended Support Release channel. These patched versions resolve the Networking component privilege escalation flaw. Download updates through Firefox's built-in update mechanism (Menu → Help → About Firefox) or from Mozilla's official distribution channels at mozilla.org. For enterprise deployments, consult Mozilla's security advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/ (Firefox 150) and https://www.mozilla.org/security/advisories/mfsa2026-32/ (Firefox ESR 140.10) for deployment guidance. If immediate patching is not feasible, implement compensating controls: restrict Firefox usage to trusted internal sites only via proxy whitelisting (breaks general web browsing functionality), deploy browser isolation technology to sandbox Firefox in remote containers (adds latency and infrastructure cost), or temporarily switch to alternative browsers until patching is complete (requires user retraining and may impact compatibility with Firefox-specific enterprise applications). These workarounds significantly degrade user experience and should only be temporary measures.

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Same weakness CWE-269 – Improper Privilege Management

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CVE-2017-5689 CRITICAL POC
9.8
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CVE-2017-11467 CRITICAL POC
9.8
CVE-2014-1510 CRITICAL POC
9.8
CVE-2014-1511 CRITICAL POC
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CVE-2016-0151 HIGH POC
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CVE-2013-0643 HIGH
8.8

Same technique Privilege Escalation

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CVE-2025-47812 CRITICAL POC
10.0
CVE-2013-0422 CRITICAL POC
9.8
CVE-2013-0632 CRITICAL POC
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9.8
CVE-2016-10372 CRITICAL POC
9.8
CVE-2014-9583 CRITICAL POC
10.0
CVE-2012-0297 CRITICAL POC
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-2026-6761 vulnerability details – vuln.today
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