CVE-2020-26973

HighCVSS 8.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
MozillaFirefox>= unspecified, < 84
MozillaThunderbird>= unspecified, < 78.6
MozillaFirefox ESR>= unspecified, < 78.6

References

Timeline

Published
Jan 7, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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