When a user explicitly requested Thunderbird to decrypt an inline OpenPGP message that was embedded in a text section of an email that was formatted and styled with HTML and CSS, then the decrypted contents were rendered in a context in which the CSS styles from the outer messages were active. If the user had additionally allowed loading of the remote content referenced by the outer email message, and the email was crafted by the sender using a combination of CSS rules and fonts and animations, then it was possible to extract the secret contents of the email. This vulnerability was fixed in Thunderbird 147.0.1 and Thunderbird 140.7.1.
CVSS Details
- CVSS 3.1 Base Score: 4.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade thunderbird | Feb 5, 2026 | Feb 5, 2026 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.7.1Upgrade to the latest version of Mozilla Thunderbird | Jan 29, 2026 | Jan 27, 2026 |
| Suse | — | Upgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-translations-common | Feb 6, 2026 | Feb 5, 2026 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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