Mitigation bypass in the Networking: Cache component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Mozilla
  • Firefox
  • Firefox Esr
  • Thunderbird

Configuration 1 [-]

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

No data.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2015220 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-2791 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-2791 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-13/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-15/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2791 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-16/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-17/ cve-icon cve-icon
History

Sat, 28 Feb 2026 04:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-288
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 25 Feb 2026 14:45:00 +0000

Type Values Removed Values Added
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
Metrics cvssV3_1

{'score': 3.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N'}

 cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Wed, 25 Feb 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Mozilla firefox Esr
Mozilla thunderbird
Vendors & Products Mozilla
Mozilla firefox
Mozilla firefox Esr
Mozilla thunderbird

Wed, 25 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 3.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N'}

threat_severity

Low

Tue, 24 Feb 2026 18:00:00 +0000

Type Values Removed Values Added
Description Mitigation bypass in the Networking: Cache component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. Mitigation bypass in the Networking: Cache component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
References

Tue, 24 Feb 2026 14:00:00 +0000

Type Values Removed Values Added
Description Mitigation bypass in the Networking: Cache component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8.
Title Mitigation bypass in the Networking: Cache component
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2026-02-24T13:33:22.237Z

Updated: 2026-02-28T03:10:50.975Z

Reserved: 2026-02-19T15:06:35.590Z

Link: CVE-2026-2791

cve-icon Vulnrichment

Updated: 2026-02-28T03:10:45.183Z

cve-icon NVD

Status : Modified

Published: 2026-02-24T14:16:27.580

Modified: 2026-02-28T04:16:19.447

Link: CVE-2026-2791

cve-icon Redhat

Severity : Low

Publid Date: 2026-02-24T13:33:22Z

Links: CVE-2026-2791 - Bugzilla