CVE-2026-3846 Details
Description
Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.
A same-origin policy bypass vulnerability has been identified in the CSS Parsing and Computation component of Mozilla Firefox. This issue affects versions of Firefox prior to 148.0.2. The vulnerability arises from a flaw in how the browser's CSS parsing engine handles same-origin policy, potentially allowing maliciously crafted styles to be applied in a way that bypasses security restrictions.
Users can upgrade to Firefox version 148.0.2 or later 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 Mar 10, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2018400 | [email protected] | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-19/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-346 | Origin Validation Error | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 148.0.2 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 13, 2026 | CVE Modified | [email protected] |
| Mar 11, 2026 | Initial Analysis | [email protected] |
| Mar 10, 2026 | New CVE Received | [email protected] |
| Mar 10, 2026 | CVE Modified | CISA-ADP |