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VULNERABILITIES

CVE-2026-74959 Details

Description

Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2047853 [email protected]Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-74/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-76/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-77/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-78/ [email protected]Vendor Advisory

see all 7 references

Weakness Enumeration

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

Affected Products

ProductVersions
mozilla firefox
< 140.14.0
>= 141.0, < 153.1.0

CPE

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

Remediation

  • No remediation found in references.
mozilla thunderbird
< 140.14.0
>= 141.0, < 153.1.0

CPE

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

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-74959
NVD Published Date:
Aug 18, 2026
NVD Last Modified:
Aug 24, 2026
Source:
[email protected]
CVE-2026-74959 Details - Not Deferred