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Mozilla Firefox CVE-2026-6750

| EUVDEUVD-2026-24091 HIGH
Improper Privilege Management (CWE-269)
2026-04-21 mozilla GHSA-hqjc-gx24-xhpp
Privilege Escalation Mozilla
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
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

12
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Severity Changed
Apr 22, 2026 - 16:22 NVD
HIGH CRITICAL
CVSS changed
Apr 22, 2026 - 16:22 NVD
8.8 (HIGH) 9.8 (CRITICAL)
Analysis Updated
Apr 22, 2026 - 00:41 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
5.3 (MEDIUM) 8.8 (HIGH)
Analysis Generated
Apr 21, 2026 - 18:24 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
5.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24091
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 Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

AnalysisAI

Privilege escalation in Firefox WebRender allows remote attackers to gain elevated access through malicious web content requiring user interaction. Affects Firefox versions before 150, Firefox ESR before 115.35, and Firefox ESR before 140.10. Mozilla released patches in advisories MFSA2026-30 through MFSA2026-34. CVSS 8.8 (High) severity with network attack vector, but exploitation requires user interaction (visiting malicious site). No public exploit identified at time of analysis, with SSVC framework indicating no confirmed exploitation and partial technical impact.

Technical ContextAI

WebRender is Mozilla's GPU-based rendering engine written in Rust, introduced to replace the legacy graphics stack. This vulnerability stems from CWE-269 (Improper Privilege Management), indicating the WebRender component fails to properly enforce privilege boundaries between web content and browser processes. The affected CPE (cpe:2.3:a:mozilla:firefox) confirms this impacts the Firefox application specifically. WebRender operates within Firefox's multi-process architecture (Electrolysis/e10s), where content processes should operate with restricted privileges. A flaw in privilege enforcement could allow malicious web content to escape sandboxing restrictions or elevate from content process privileges to parent process or system-level access, breaking the security model that isolates untrusted web content from sensitive browser functions and user system resources.

RemediationAI

Vendor-released patches: Upgrade Firefox to version 150 or later, Firefox ESR to version 115.35 or later, or Firefox ESR to version 140.10 or later depending on your release channel. Firefox users with automatic updates enabled will receive patches automatically. Enterprise deployments should update via standard software distribution mechanisms referencing Mozilla Security Advisories MFSA2026-30 through MFSA2026-34 at https://www.mozilla.org/security/advisories/. For environments unable to immediately patch, compensating controls include restricting browser usage to trusted sites only via web filtering/proxy policies (trade-off: significantly limits browser utility and user productivity), deploying Firefox in isolated virtual machines or containers (trade-off: performance overhead and user experience friction), or temporarily switching to alternative browsers until patching is feasible (trade-off: application compatibility issues and user retraining). However, these workarounds provide incomplete protection and patching remains the only complete remediation. Bugzilla tracking: https://bugzilla.mozilla.org/show_bug.cgi?id=2023407.

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Same weakness CWE-269 – Improper Privilege Management

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Same technique Privilege Escalation

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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-2026-6750 vulnerability details – vuln.today
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