CVE-2020-26973

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.

8.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.14%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

Affected: Mozilla Thunderbird

Affected: Mozilla Firefox ESR

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2020-54/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-56/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-55/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1680084	permissions required

Frequently Asked Questions

What is the severity of CVE-2020-26973?: CVE-2020-26973 has been scored as a high severity vulnerability.
How to fix CVE-2020-26973?: To fix CVE-2020-26973, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26973 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-26973 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-26973?: CVE-2020-26973 affects Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR.

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