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Critical 9.6Published Oct 13, 2026
CVE-2026-109755Sandbox escape in the DOM: Content Processes component
Updated under an hour ago ()
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It affects Mozilla Firefox and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.34%, higher than 26% of scored CVEs.
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Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
- CVSS
- 9.6 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-693
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.34% (percentile 26)
- Assigned by
- mozilla
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 13, 2026
Affected products
Mozilla Firefox mozilla:firefox (from the name) | from 158 not affected | CNA record |
Mozilla Thunderbird mozilla:thunderbird (from the name) | from 158 not affected | CNA record |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2068448
- https://www.mozilla.org/security/advisories/mfsa2026-106/
- https://www.mozilla.org/security/advisories/mfsa2026-109/
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.