High severity · published Jan 7, 2021
CVE-2020-26973
Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed
8.8
CVSS
1.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 76% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 84.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.6.0 · source: NVD
TH
Thunderbird · Mozilla
before 78.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26973
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26973
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1680084
Vendor Advisory
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/
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