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OpenAdvisories
Medium DLA-4466-1 1 CVE

thunderbird - security update

Published Feb 4, 2026 · Updated Feb 4, 2026

Fixed packages 1

ReleasePackageFixed in
Debian · 11 thunderbird 1:140.7.1esr-1~deb11u1

Vulnerabilities 1

  • Medium 4.3

    CSS-based exfiltration of the content from partially encrypted emails when allowing remote content

    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 f…