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6.5 Medium

CVE-2025-10529 Same-origin policy bypass in the Layout component

Description

Same-origin policy bypass in the Layout component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 143	earliest → < 143	143
Firefox 140.3	earliest → < 140.3	140.3
Firefox ESR 140.3	earliest → < 140.3	140.3
Thunderbird 143	earliest → < 143	143
Thunderbird 140.3	earliest → < 140.3	140.3

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published September 16, 2025
Last modified April 13, 2026

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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