CVE-2026-2791 Details
Description
Mitigation bypass in the Networking: Cache component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
A vulnerability allowing for mitigation bypass has been identified in the Networking: Cache component, affecting multiple Mozilla products. This issue is present in Firefox versions prior to 148, Firefox ESR versions prior to 140.8, Thunderbird versions prior to 148, and Thunderbird ESR versions prior to 140.8.
Users can upgrade to Firefox 148, Firefox ESR 140.8, Thunderbird 148, or Thunderbird ESR 140.8 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 28, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2015220 | [email protected] | Issue TrackingPermissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-13/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-15/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-16/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-17/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
| CWE-288 | Authentication Bypass Using an Alternate Path or Channel | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 140.8.0 < 148.0 |
CPE
Remediation
| |
| mozilla thunderbird | < 140.8.0 < 148.0 |
CPE
Remediation
| |
Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Apr 13, 2026 | CVE Modified | [email protected] |
| Feb 28, 2026 | CVE Modified | CISA-ADP |
| Feb 25, 2026 | Initial Analysis | [email protected] |
| Feb 24, 2026 | CVE Modified | [email protected] |
| Feb 24, 2026 | New CVE Received | [email protected] |