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

EPSS Scores

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Meta Information

Published
2026-03-10
Last Modified
2026-04-13
Generated
2026-07-26
AI Q&A
2026-03-10
EPSS Evaluated
2026-07-25
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.

Attack-Flow Graph

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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.

Detection Guidance

I don't know

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

Mitigation Strategies

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