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8.8 High

CVE-2026-2790 Same-origin policy bypass in the Networking: JAR component

Description

Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Affected products and versions

Product Affected versions Fixed in
Firefox 148 earliest → < 148 148
Firefox 140.8 earliest → < 140.8 140.8
Thunderbird 148 earliest → < 148 148
Thunderbird 140.8 earliest → < 140.8 140.8

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High
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