CVE-2026-0818

medium

Description

CSS-based exfiltration of the content from partially encrypted emails when allowing remote content. This vulnerability affects Thunderbird < 147.0.1 and Thunderbird < 140.7.1.

References

https://www.mozilla.org/security/advisories/mfsa2026-08/

https://www.mozilla.org/security/advisories/mfsa2026-07/

https://bugzilla.mozilla.org/show_bug.cgi?id=1881530

Details

Source: Mitre, NVD

Published: 2026-01-28

Updated: 2026-01-29

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 4.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N