CVE-2026-4728 — MEDIUM (6.5)

Q: What is CVE-2026-4728?

CVE-2026-4728 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Q: How severe is CVE-2026-4728?

CVE-2026-4728 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-4728?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Thunderbird.

Vulnerability Description

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

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Mozilla	Firefox	< 149.0
Mozilla	Thunderbird	< 149.0

Related Weaknesses (CWE)

CWE-290

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013179Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-23/Vendor Advisory

FAQ

What is CVE-2026-4728?

CVE-2026-4728 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

How severe is CVE-2026-4728?

CVE-2026-4728 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-4728?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Thunderbird.