CVE-2025-8029

CVE-2025-8029: javascript: URLs executed on object and embed tags

Published July 22, 2025
Last update July 29, 2026
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CVSS base score

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What the vulnerability does

01Description

Thunderbird executed `javascript:` URLs when used in `object` and `embed` tags. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Key dates

02Disclosure timeline

July 22, 2025 CVE published
July 29, 2026 Record updated