CVE-2026-4728 — Authentication Bypass by Spoofing in Mozilla Firefox

CWE-290 — Authentication Bypass by Spoofing9 documents8 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 98.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedMar 24

Description

Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NExploitability: 2.8 | Impact: 3.6

Affected Packages2 packages

▶NVDmozilla/firefox< 149.0
▶NVDmozilla/thunderbird< 149.0

🔴Vulnerability Details

3
CVEList
Spoofing issue in the Privacy: Anti-Tracking component↗2026-03-24
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GHSA
GHSA-c3hv-rw36-5mgq: Spoofing issue in the Privacy: Anti-Tracking component↗2026-03-24
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OSV
CVE-2026-4728: Spoofing issue in the Privacy: Anti-Tracking component↗2026-03-24
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📋Vendor Advisories

4
Red Hat
firefox: Spoofing issue in the Privacy: Anti-Tracking component↗2026-03-24
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Debian
CVE-2026-4728: firefox - Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability affec...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-23: CVE-2026-4728↗
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Mozilla
Mozilla Foundation Security Advisory 2026-20: CVE-2026-4728↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-4728 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-4728 — Authentication Bypass by Spoofing | cvebase