CVE-2026-74960
High · 8.1CVSS
8.1
EPSS
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Published
Aug 18, 2026
CISA due date
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The record
Site isolation issue in the WebExtensions 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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