CVE-2026-0818

Katalog CVE

CVSS 4.3 · Medium EPSS 0,18%

Kerentanan Improper Encoding or Escaping of Output pada mozilla thunderbird. Skor CVSS 3.1 4.3 (Medium) menurut CISA ADP.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

28 Januari 2026

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

4.3 (Medium), sumber CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-116: Improper Encoding or Escaping of Output
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-352: Cross-Site Request Forgery (CSRF)

EPSS (30 hari)

0,18% peluang dieksploitasi; lebih tinggi dari 6,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://www.mozilla.org/security/advisories/mfsa2026-07/ advisory vendor
• https://www.mozilla.org/security/advisories/mfsa2026-08/ advisory vendor
• https://bugzilla.mozilla.org/show_bug.cgi?id=1881530 permissions required
• https://lists.debian.org/debian-lts-announce/2026/02/msg00005.html