CVE-2026-2790 Details
Description
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
A same-origin policy bypass vulnerability has been identified in the Networking: JAR component, affecting multiple versions of Firefox and Thunderbird. Specifically, this vulnerability impacts 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 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2008426 | [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-346 | Origin Validation Error | 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 26, 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] |