CVEvulnerability

CVE-2020-26973

8.8 HIGH Published 2021-01-07 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2021-01-07
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected]): 6.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:P

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.

Affected configurations

• mozilla firefox (< 84.0) • mozilla firefox esr (< 78.6.0) • mozilla thunderbird (< 78.6.0)

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1680084 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2020-54/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-55/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-56/ Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1680084 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2020-54/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-55/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-56/ Vendor Advisory