Vulnerability in Mozilla Firefox

CVE-2020-26973

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.

EPSS: 0.015 (72.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

References

Frequently asked questions

What is CVE-2020-26973?
CVE-2020-26973 is a high-severity vulnerability in Mozilla Firefox. CVSS score: 8.8/10. Published 2021-01-07.
How severe is CVE-2020-26973?
High severity. CVSS v3 base score is 8.8 out of 10.