CVE-2020-26973
published 2021-01-07CVE-2020-26973: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This…
PriorityP343high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
1.55%
72.1th percentile
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
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 84.0-1 (sid) | firefox 84.0-1 (sid) |
| debian | firefox-esr | < firefox 84.0-1 (sid) | firefox 84.0-1 (sid) |
| debian | thunderbird | < firefox 84.0-1 (sid) | firefox 84.0-1 (sid) |
| mozilla | firefox | < 84.0 | 84.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= unspecified < 84 | 84 |
| mozilla | firefox_esr | < 78.6.0 | 78.6.0 |
| mozilla | firefox_esr | >= unspecified < 78.6 | 78.6 |
| mozilla | thunderbird | < 78.6.0 | 78.6.0 |
| mozilla | thunderbird | >= 0 < 1:78.6.0-1 | 1:78.6.0-1 |
| mozilla | thunderbird | >= 0 < 1:78.6.0-1 | 1:78.6.0-1 |
| mozilla | thunderbird | >= 0 < 1:78.6.0-1 | 1:78.6.0-1 |
| mozilla | thunderbird | >= 0 < 1:78.6.0-1 | 1:78.6.0-1 |
| mozilla | thunderbird | >= unspecified < 78.6 | 78.6 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv2.06.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
osv8.8HIGH
vendor_debian8.8HIGH
vendor_redhat8.8HIGH
vendor_ubuntu6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-7p7r-8rqq-6xf9: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed
ghsa_unreviewed·2022-05-24
CVE-2020-26973 [HIGH] GHSA-7p7r-8rqq-6xf9: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed
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.
OSV
CVE-2020-26973: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed
osv·2021-01-07·CVSS 8.8
CVE-2020-26973 [HIGH] CVE-2020-26973: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed
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.
Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2021-01-20·CVSS 6.5
CVE-2020-16042 [MEDIUM] Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass the CSS sanitizer, or execute
arbitrary code. (CVE-2020-16042, CVE-2020-16044, CVE-2020-26971,
CVE-2020-26973, CVE-2020-26974, CVE-2020-26978, CVE-2020-35113)
It was discovered that the proxy.onRequest API did not catch
view-source URLs. If a user were tricked in to installing an
extension with the proxy permission and opening View Source, an
attacker could potentially exploit this to obtain sensitive
information. (CVE-2020-35111)
A stack ov
Red Hat
Mozilla: CSS Sanitizer performed incorrect sanitization
vendor_redhat·2020-12-15·CVSS 8.8
CVE-2020-26973 [HIGH] CWE-20 Mozilla: CSS Sanitizer performed incorrect sanitization
Mozilla: CSS Sanitizer performed incorrect sanitization
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.
The Mozilla Foundation Security Advisory describes this flaw as:
Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass.
Package: thunderbird (Red Hat Enterprise Linux 5) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: thunderbird (Red Hat Enterprise Linux 6) - Out of support scope
Ubuntu
Firefox vulnerabilities
vendor_ubuntu·2020-12-15·CVSS 6.5
CVE-2020-26971 [MEDIUM] Firefox vulnerabilities
Title: Firefox vulnerabilities
Summary: Firefox could be made to crash or run programs as your login if it
opened a malicious website.
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, bypass the CSS sanitizer, bypass security restrictions,
spoof the URL bar, or execute arbitrary code. (CVE-2020-16042,
CVE-2020-26971, CVE-2020-26972, CVE-2020-26793, CVE-2020-26974,
CVE-2020-26976, CVE-2020-26978, CVE-2020-26979,
CVE-2020-35113, CVE-2020-35114)
It was discovered that the proxy.onRequest API did not catch
view-source URLs. If a user were tricked in to installing an
extension with the proxy permission and opening View So
Debian
CVE-2020-26973: firefox - Certain input to the CSS Sanitizer confused it, resulting in incorrect component...
vendor_debian·2020·CVSS 8.8
CVE-2020-26973 [HIGH] CVE-2020-26973: firefox - Certain input to the CSS Sanitizer confused it, resulting in incorrect component...
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.
Scope: local
sid: resolved (fixed in 84.0-1)
Mozilla
Mozilla Foundation Security Advisory 2020-54: CVE-2020-26973
vendor_mozilla·CVSS 8.8
CVE-2020-26973 [HIGH] Mozilla Foundation Security Advisory 2020-54: CVE-2020-26973
Mozilla Foundation Security Advisory 2020-54
CVE: CVE-2020-26973
Product: Firefox
Impact: high
Fixed in: Firefox 84
Mozilla
Mozilla Foundation Security Advisory 2020-55: CVE-2020-26973
vendor_mozilla·CVSS 8.8
CVE-2020-26973 [HIGH] Mozilla Foundation Security Advisory 2020-55: CVE-2020-26973
Mozilla Foundation Security Advisory 2020-55
CVE: CVE-2020-26973
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 78.6
Mozilla
Mozilla Foundation Security Advisory 2020-56: CVE-2020-26973
vendor_mozilla·CVSS 8.8
CVE-2020-26973 [HIGH] Mozilla Foundation Security Advisory 2020-56: CVE-2020-26973
Mozilla Foundation Security Advisory 2020-56
CVE: CVE-2020-26973
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 78.6
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1680084https://www.mozilla.org/security/advisories/mfsa2020-54/https://www.mozilla.org/security/advisories/mfsa2020-55/https://www.mozilla.org/security/advisories/mfsa2020-56/https://bugzilla.mozilla.org/show_bug.cgi?id=1680084https://www.mozilla.org/security/advisories/mfsa2020-54/https://www.mozilla.org/security/advisories/mfsa2020-55/https://www.mozilla.org/security/advisories/mfsa2020-56/
2021-01-07
Published