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Firefox CVE-2026-6768

| EUVDEUVD-2026-24109 CRITICAL
Authentication Bypass Using an Alternate Path or Channel (CWE-288)
2026-04-21 mozilla GHSA-q5x7-w9rr-q429
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

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 17:22 vuln.today
CVSS changed
Apr 21, 2026 - 17:22 NVD
9.8 (CRITICAL)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24109
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 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 bypass security controls via network requests, achieving full confidentiality, integrity, and availability compromise. Affects Firefox versions prior to 150. Mozilla has released patches in security advisories MFSA2026-30 and MFSA2026-33. CISA SSVC framework classifies this as fully automatable with total technical impact, though no active exploitation is confirmed at time of analysis. CVSS 9.8 critical severity reflects the network attack vector with no authentication or user interaction required.

Technical ContextAI

This vulnerability resides in Firefox's Networking: Cookies component, which implements cookie storage, parsing, and transmission per RFC 6265. The root cause is CWE-288 (Authentication Bypass Using an Alternate Path or Channel), indicating the flaw allows circumvention of authentication mechanisms through manipulation of cookie-based session management or Same-Origin Policy enforcement. The CPE identifier cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms Mozilla Firefox browser as the affected product. Cookie handling is fundamental to web application authentication and session management, making vulnerabilities in this subsystem particularly severe as they can enable session hijacking, authentication bypass, or cross-site tracking violations. The 'mitigation bypass' designation suggests this may circumvent existing security controls like SameSite cookie attributes, Secure flags, or HttpOnly protections.

RemediationAI

Upgrade to Firefox version 150 or later immediately, as confirmed by Mozilla security advisories MFSA2026-30 and MFSA2026-33. Firefox's automatic update mechanism will deploy this fix to most consumer installations within 24-48 hours of release. Enterprise administrators using managed deployments should prioritize distribution of Firefox 150 through software management systems, as the vulnerability permits unauthenticated network-based attacks requiring no user interaction. For environments unable to upgrade immediately, implement compensating controls with significant usability trade-offs: disable JavaScript via about:config (breaks most web applications), use browser isolation technologies like Chromium-based alternatives temporarily (introduces workflow disruption), or deploy network-layer filtering to restrict browser traffic to trusted domains only (requires extensive allow-list maintenance and breaks general web browsing). These mitigations severely impact functionality and should only be temporary measures until patching. Review Mozilla's detailed advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/ and https://www.mozilla.org/security/advisories/mfsa2026-33/ for additional context and potential related fixes in the same release.

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

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Same technique Authentication Bypass

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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-2026-6768 vulnerability details – vuln.today
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