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
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
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 148.0.2 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-346 | The product does not properly verify that the source of data or communication is valid. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a same-origin policy bypass in the CSS Parsing and Computation component of Firefox versions earlier than 148.0.2.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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