CVE-2020-26973 — Improper Input Validation in Mozilla Firefox

CWE-20 — Improper Input Validation11 documents8 sources
Severity
8.8HIGHNVD
EPSS
0.3%
top 44.38%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedJan 7
Latest updateMay 24

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:HExploitability: 2.8 | Impact: 5.9

Affected Packages7 packages

▶CVEListV5mozilla/firefoxunspecified — 84
▶NVDmozilla/firefox< 84.0
▶CVEListV5mozilla/firefox_esrunspecified — 78.6
▶NVDmozilla/firefox_esr< 78.6.0
▶CVEListV5mozilla/thunderbirdunspecified — 78.6

🔴Vulnerability Details

3
GHSA
GHSA-7p7r-8rqq-6xf9: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed↗2022-05-24
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OSV
CVE-2020-26973: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed↗2021-01-07
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CVEList
CVE-2020-26973: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed↗2021-01-07
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2021-01-20
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Red Hat
Mozilla: CSS Sanitizer performed incorrect sanitization↗2020-12-15
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Ubuntu
Firefox vulnerabilities↗2020-12-15
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Debian
CVE-2020-26973: firefox - Certain input to the CSS Sanitizer confused it, resulting in incorrect component...↗2020
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Mozilla
Mozilla Foundation Security Advisory 2020-54: CVE-2020-26973↗
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CVE-2020-26973 — Improper Input Validation in Mozilla | cvebase