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Vulnerability details: VCID-rj58-m29v-aaan
Vulnerability ID VCID-rj58-m29v-aaan
Aliases CVE-2020-26973
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-20 Improper Input Validation
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-26973.html
rhas Important https://access.redhat.com/errata/RHSA-2020:5561
rhas Important https://access.redhat.com/errata/RHSA-2020:5562
rhas Important https://access.redhat.com/errata/RHSA-2020:5563
rhas Important https://access.redhat.com/errata/RHSA-2020:5564
rhas Important https://access.redhat.com/errata/RHSA-2020:5565
rhas Important https://access.redhat.com/errata/RHSA-2020:5618
rhas Important https://access.redhat.com/errata/RHSA-2020:5622
rhas Important https://access.redhat.com/errata/RHSA-2020:5624
rhas Important https://access.redhat.com/errata/RHSA-2020:5644
rhas Important https://access.redhat.com/errata/RHSA-2020:5645
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26973.json
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0014 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00312 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00430 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
epss 0.00482 https://api.first.org/data/v1/epss?cve=CVE-2020-26973
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1908023
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16042
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26971
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26973
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26974
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26978
generic_textual Low https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35111
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35113
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2020-26973
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-26973
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-26973
archlinux High https://security.archlinux.org/AVG-1315
archlinux High https://security.archlinux.org/AVG-1362
generic_textual Medium https://ubuntu.com/security/notices/USN-4671-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4701-1
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-54
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26973
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-55
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-56
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26973
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-26973.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26973.json
https://api.first.org/data/v1/epss?cve=CVE-2020-26973
https://bugzilla.mozilla.org/show_bug.cgi?id=1680084
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16042
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26971
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26973
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26974
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26978
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35111
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35113
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://ubuntu.com/security/notices/USN-4671-1
https://ubuntu.com/security/notices/USN-4701-1
https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26973
https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26973
https://www.mozilla.org/security/advisories/mfsa2020-54/
https://www.mozilla.org/security/advisories/mfsa2020-55/
https://www.mozilla.org/security/advisories/mfsa2020-56/
1908023 https://bugzilla.redhat.com/show_bug.cgi?id=1908023
ASA-202012-23 https://security.archlinux.org/ASA-202012-23
ASA-202012-25 https://security.archlinux.org/ASA-202012-25
AVG-1315 https://security.archlinux.org/AVG-1315
AVG-1362 https://security.archlinux.org/AVG-1362
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2020-26973 https://nvd.nist.gov/vuln/detail/CVE-2020-26973
GLSA-202012-20 https://security.gentoo.org/glsa/202012-20
mfsa2020-54 https://www.mozilla.org/en-US/security/advisories/mfsa2020-54
mfsa2020-55 https://www.mozilla.org/en-US/security/advisories/mfsa2020-55
mfsa2020-56 https://www.mozilla.org/en-US/security/advisories/mfsa2020-56
RHSA-2020:5561 https://access.redhat.com/errata/RHSA-2020:5561
RHSA-2020:5562 https://access.redhat.com/errata/RHSA-2020:5562
RHSA-2020:5563 https://access.redhat.com/errata/RHSA-2020:5563
RHSA-2020:5564 https://access.redhat.com/errata/RHSA-2020:5564
RHSA-2020:5565 https://access.redhat.com/errata/RHSA-2020:5565
RHSA-2020:5618 https://access.redhat.com/errata/RHSA-2020:5618
RHSA-2020:5622 https://access.redhat.com/errata/RHSA-2020:5622
RHSA-2020:5624 https://access.redhat.com/errata/RHSA-2020:5624
RHSA-2020:5644 https://access.redhat.com/errata/RHSA-2020:5644
RHSA-2020:5645 https://access.redhat.com/errata/RHSA-2020:5645
USN-4671-1 https://usn.ubuntu.com/4671-1/
USN-4701-1 https://usn.ubuntu.com/4701-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26973.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26973
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26973
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26973
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.30758
EPSS Score 0.0014
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.