CVE-2026-3846
Received Received - Intake
Same-Origin Policy Bypass in Firefox CSS Parsing

Publication date: 2026-03-10

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.
CVSS Scores
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Meta Information
Published
2026-03-10
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-03-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3846
EUVD
EUVD-2026-10504
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox to 148.0.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-346 The product does not properly verify that the source of data or communication is valid.
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Executive Summary

This vulnerability is a same-origin policy bypass in the CSS Parsing and Computation component of Firefox versions earlier than 148.0.2.

Impact Analysis

The vulnerability can impact you by allowing an attacker to bypass the same-origin policy, potentially leading to unauthorized modification or influence over web content. According to the CVSS score, it has a high impact on integrity but does not affect confidentiality or availability.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

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