CVE-2026-75874
Critical · 10.0CVSS
10.0
EPSS
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Published
Aug 18, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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