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VULNERABILITIES

CVE-2026-75874 Details

Description

Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:10 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2039972 [email protected]Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-74/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-78/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-83/ [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-84/ [email protected]

see all 8 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-693Protection Mechanism FailureCISA-ADP

Affected Products

ProductVersions
mozilla firefox
< 154.0.0

CPE

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
mozilla thunderbird
< 154.0

CPE

  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

6 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-75874
NVD Published Date:
Aug 18, 2026
NVD Last Modified:
Sep 1, 2026
Source:
[email protected]
CVE-2026-75874 Details - Not Deferred