Vulnerability CVE-2020-26973: Information

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.

Severity: HIGH (8.8) Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

URL: https://nvd.nist.gov/vuln/detail/CVE-2020-26973
Published: Jan. 7, 2021
Modified: Jan. 12, 2021

Fixed packages

Package name
Branch
Fixed in version
Version from repository
Errata ID
Task #
State
firefoxsisyphus84.0-alt1127.0-alt1ALT-PU-2020-3529-1263596Fixed
firefoxp1084.0-alt1118.0.2-alt0.p10.1ALT-PU-2020-3529-1263596Fixed
firefoxp993.0-alt0.p9.1105.0.1-alt0.c9.1ALT-PU-2022-1782-1288073Fixed
firefoxc10f184.0-alt1112.0.2-alt0.p10.1ALT-PU-2020-3529-1263596Fixed
firefoxc9f293.0-alt0.p9.1105.0.1-alt0.c9.1ALT-PU-2021-3368-1288792Fixed
firefoxp1184.0-alt1126.0.1-alt1ALT-PU-2020-3529-1263596Fixed
firefox-esrsisyphus78.6.0-alt1115.11.0-alt1ALT-PU-2020-3513-1263479Fixed
firefox-esrp1091.1.0-alt1115.11.0-alt1ALT-PU-2021-2881-1284980Fixed
firefox-esrp978.6.1-alt0.1.p9102.11.0-alt0.c9.1ALT-PU-2021-1151-1264322Fixed
firefox-esrc10f191.1.0-alt1115.9.1-alt0.c10.1ALT-PU-2021-2881-1284980Fixed
firefox-esrc9f291.3.0-alt1.c9.1102.12.0-alt0.c9.1ALT-PU-2021-3369-1288792Fixed
firefox-esrp1178.6.0-alt1115.11.0-alt1ALT-PU-2020-3513-1263479Fixed
thunderbirdsisyphus78.6.0-alt1115.9.0-alt1ALT-PU-2020-3515-1263485Fixed
thunderbirdp1078.6.0-alt1115.9.0-alt1ALT-PU-2020-3515-1263485Fixed
thunderbirdp978.7.0-alt0.1.p9102.11.0-alt0.c9.1ALT-PU-2021-1200-1265306Fixed
thunderbirdc10f178.6.0-alt1115.9.0-alt0.c10.1ALT-PU-2020-3515-1263485Fixed
thunderbirdc9f278.7.0-alt0.1.c9102.11.0-alt0.c9.1ALT-PU-2021-1369-1264611Fixed
thunderbirdp1178.6.0-alt1115.9.0-alt1ALT-PU-2020-3515-1263485Fixed

References to Advisories, Solutions, and Tools

Hyperlink
Resource
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

    1. Configuration 1

      cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
      End excliding
      78.6.0
      cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
      End excliding
      78.6.0
      cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
      End excliding
      84.0
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