CVE-2020-26973

HIGH

Firefox <84, Thunderbird <78.6, Firefox ESR <78.6 - Info Disclosure

Title source: llm
STIX 2.1

Description

Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

References (4)

Core 4
Core References
Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1680084

Scores

CVSS v3 8.8
EPSS 0.0033
EPSS Percentile 55.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

Status published
Products (3)
mozilla/firefox < 84.0
mozilla/firefox_esr < 78.6.0
mozilla/thunderbird < 78.6.0
Published Jan 07, 2021
Tracked Since Feb 18, 2026