CVEvulnerability

CVE-2026-0818

4.3 MEDIUM Published 2026-01-28 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2026-01-28
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weaknesses
CWE-116, CWE-200, CWE-352

Description

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.

Affected configurations

• mozilla thunderbird (< 140.7.1) • mozilla thunderbird (< 147.0.1)

Related

Weakness · CWE (3)

  • CWE-116 Improper Encoding or Escaping of Output weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness
  • CWE-352 Cross-Site Request Forgery weakness

References