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Firefox CVE-2026-6760

| EUVDEUVD-2026-24101 CRITICAL
Authentication Bypass Using an Alternate Path or Channel (CWE-288)
2026-04-21 mozilla GHSA-h5hc-2g7f-gxgj
Authentication Bypass Mozilla Red Hat Suse
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

7
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Re-analysis Queued
Apr 22, 2026 - 17:52 vuln.today
cvss_changed
Analysis Generated
Apr 22, 2026 - 16:22 vuln.today
CVSS changed
Apr 22, 2026 - 16:22 NVD
9.8 (CRITICAL)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24101
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
CRITICAL 9.8

DescriptionCVE.org

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Authentication bypass in Firefox's cookie handling mechanism allows remote unauthenticated attackers to circumvent security controls and potentially execute arbitrary code or access protected resources. The vulnerability affects Firefox versions prior to 150 and has a critical CVSS score of 9.8 (network-exploitable, no authentication required, low complexity). Despite the severe CVSS rating, EPSS probability indicates only 0.02% likelihood of exploitation (4th percentile), suggesting limited real-world targeting. Mozilla has patched this in Firefox 150 per security advisories MFSA2026-30 and MFSA2026-33. No evidence of active exploitation (not in CISA KEV) or public proof-of-concept code at time of analysis.

Technical ContextAI

This vulnerability resides in Firefox's Networking: Cookies component, which manages HTTP cookie processing, storage, and transmission. The root cause is classified as CWE-288 (Authentication Bypass Using an Alternate Path or Channel), indicating the flaw allows attackers to circumvent authentication mechanisms through manipulation of cookie handling logic. Cookie-based authentication is fundamental to web security - browsers must correctly validate, isolate, and enforce cookie policies including SameSite attributes, domain restrictions, and secure flags. A bypass in this component could allow attackers to forge session cookies, bypass CSRF protections, or access cookies meant for other origins, undermining Same-Origin Policy enforcement. The CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* indicates all Firefox versions prior to the fix are potentially vulnerable, spanning desktop deployments across Windows, macOS, and Linux platforms.

RemediationAI

Primary remediation is upgrading to Firefox 150 or later, which contains the complete fix for this authentication bypass. Enterprise deployments should use Mozilla's standard update mechanisms: Firefox Update Settings (Preferences > General > Firefox Updates) for individual installations, or enterprise policy deployment tools like Windows Group Policy (policies.json) or macOS configuration profiles for fleet management. Detailed upgrade procedures are available in Mozilla's security advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/ and https://www.mozilla.org/security/advisories/mfsa2026-33/. For environments unable to immediately deploy Firefox 150, compensating controls include restricting Firefox usage to non-sensitive web applications, implementing network-level URL filtering to block untrusted sites, or temporarily substituting alternative browsers for critical authentication workflows. However, these workarounds significantly degrade usability and may introduce productivity impacts - cookie-based authentication is ubiquitous in modern web applications. Organizations should prioritize rapid patching over extended compensating control periods given Firefox's efficient update distribution.

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Same weakness CWE-288 – Authentication Bypass Using an Alternate Path or Channel

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9.8
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Same technique Authentication Bypass

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CVE-2012-1723 CRITICAL POC
9.8
CVE-2017-10271 HIGH POC
7.5
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9.8
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9.8

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-6760 vulnerability details – vuln.today
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