CVE-2026-6768 — Authentication Bypass Using an Alternate Path or Channel in Mozilla Firefox

CWE-288 — Authentication Bypass Using an Alternate Path or ChannelCWE-807 — Reliance on Untrusted Inputs in a Security Decision6 documents5 sources
Severity
9.8CRITICALNVD
EPSS
0.1%
top 83.16%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedApr 21

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶Mozillamozilla/firefox< Firefox 150
▶Mozillamozilla/thunderbird< Thunderbird 150

🔴Vulnerability Details

1
GHSA
GHSA-q5x7-w9rr-q429: Mitigation bypass in the Networking: Cookies component↗2026-04-21
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📋Vendor Advisories

3
Red Hat
Firefox: Networking: Cookies: Firefox: Mitigation bypass in Networking: Cookies component↗2026-04-21
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Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6768↗
▶
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6768↗
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💬Community

1
Bugzilla
CVE-2026-6768 Firefox: Networking: Cookies: Firefox: Mitigation bypass in Networking: Cookies component↗2026-04-21
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CVE-2026-6768 — Mozilla Firefox vulnerability | cvebase