CVE-2026-3846
MEDIUMCVSS 6.5/10EPSS 0.11%
Last modified
CVE-2026-3846 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.. EPSS estimates a 0.11% chance of exploitation in the next 30 days.
Description
Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 148.0.2 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2018400Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-19/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-3846?
Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.
How severe is CVE-2026-3846?
CVE-2026-3846 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.11% probability of exploitation in the next 30 days.
How do I fix CVE-2026-3846?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
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Are you affected by CVE-2026-3846?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST