CVE-2026-74959
Critical · 9.1CVSS
9.1
EPSS
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Published
Aug 18, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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