CVE-2026-3846 json
Same-origin policy bypass in the CSS Parsing and Computation component
published 7mo ago modified 4mo ago also EUVD-2026-10504
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 2%
- public exploits
- 0
- none known
Summary
Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.
Patch / fix
- mozilla firefox 148.0.2
- firefox-esr openSUSE Tumbleweed 153.0-1.1
- MozillaFirefox openSUSE Tumbleweed 148.0.2-1.1
opensuse advisories openSUSE-SU-2026:11373-1openSUSE-SU-2026:10324-1
Is CVE-2026-3846 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
Affected products
- Mozilla Firefox
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
mozilla.org
/security/advisories/mfsa2026-19/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=2018400
permissions-required
Sources
- CVE List CVE-2026-3846
- NVD CVE-2026-3846
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.