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Vulnerability record · CVE-2026-0881 · published 13 January 2026

CVE-2026-0881: Mozilla firefox improper access control vulnerability

Mozilla · Firefox

Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

10.0 CVSS 3.1 Critical EPSS 0.36% · top 73.2% CWE-284 · Improper access controlCWE-693 · CWE-693
10.0CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
15 Jul 2026Last modified by NVD

Description

Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=2005845 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-01/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-04/ Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-0881
https://bugzilla.redhat.com/show_bug.cgi?id=2428970
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0881.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-0881), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.