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Vulnerability details: VCID-2pvx-sqzv-aaaa
Vulnerability ID VCID-2pvx-sqzv-aaaa
Aliases CVE-2020-26956
Summary In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-26956.html
rhas Important https://access.redhat.com/errata/RHSA-2020:5231
rhas Important https://access.redhat.com/errata/RHSA-2020:5232
rhas Important https://access.redhat.com/errata/RHSA-2020:5233
rhas Important https://access.redhat.com/errata/RHSA-2020:5234
rhas Important https://access.redhat.com/errata/RHSA-2020:5235
rhas Important https://access.redhat.com/errata/RHSA-2020:5236
rhas Important https://access.redhat.com/errata/RHSA-2020:5237
rhas Important https://access.redhat.com/errata/RHSA-2020:5238
rhas Important https://access.redhat.com/errata/RHSA-2020:5239
rhas Important https://access.redhat.com/errata/RHSA-2020:5240
rhas Important https://access.redhat.com/errata/RHSA-2020:5257
rhas Important https://access.redhat.com/errata/RHSA-2020:5314
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26956.json
epss 0.00097 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00097 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
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epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00526 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
epss 0.00803 https://api.first.org/data/v1/epss?cve=CVE-2020-26956
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1898734
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16012
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26951
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26953
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26956
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26958
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26959
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26960
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26961
generic_textual Low https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26965
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26968
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-26956
cvssv3 6.1 https://nvd.nist.gov/vuln/detail/CVE-2020-26956
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2020-26956
archlinux Critical https://security.archlinux.org/AVG-1279
generic_textual Medium https://ubuntu.com/security/notices/USN-4637-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4637-2
generic_textual Medium https://ubuntu.com/security/notices/USN-4647-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2020-50/#CVE-2020-26956
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-51
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-52
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2020-52/#CVE-2020-26956
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-26956.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26956.json
https://api.first.org/data/v1/epss?cve=CVE-2020-26956
https://bugzilla.mozilla.org/show_bug.cgi?id=1666300
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16012
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26951
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26953
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26956
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26958
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26959
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26960
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26961
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26965
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26968
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://ubuntu.com/security/notices/USN-4637-1
https://ubuntu.com/security/notices/USN-4637-2
https://ubuntu.com/security/notices/USN-4647-1
https://www.mozilla.org/en-US/security/advisories/mfsa2020-50/#CVE-2020-26956
https://www.mozilla.org/en-US/security/advisories/mfsa2020-52/#CVE-2020-26956
https://www.mozilla.org/security/advisories/mfsa2020-50/
https://www.mozilla.org/security/advisories/mfsa2020-51/
https://www.mozilla.org/security/advisories/mfsa2020-52/
1898734 https://bugzilla.redhat.com/show_bug.cgi?id=1898734
ASA-202011-12 https://security.archlinux.org/ASA-202011-12
AVG-1279 https://security.archlinux.org/AVG-1279
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-2020-26956 https://nvd.nist.gov/vuln/detail/CVE-2020-26956
GLSA-202012-03 https://security.gentoo.org/glsa/202012-03
mfsa2020-50 https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
mfsa2020-51 https://www.mozilla.org/en-US/security/advisories/mfsa2020-51
mfsa2020-52 https://www.mozilla.org/en-US/security/advisories/mfsa2020-52
RHSA-2020:5231 https://access.redhat.com/errata/RHSA-2020:5231
RHSA-2020:5232 https://access.redhat.com/errata/RHSA-2020:5232
RHSA-2020:5233 https://access.redhat.com/errata/RHSA-2020:5233
RHSA-2020:5234 https://access.redhat.com/errata/RHSA-2020:5234
RHSA-2020:5235 https://access.redhat.com/errata/RHSA-2020:5235
RHSA-2020:5236 https://access.redhat.com/errata/RHSA-2020:5236
RHSA-2020:5237 https://access.redhat.com/errata/RHSA-2020:5237
RHSA-2020:5238 https://access.redhat.com/errata/RHSA-2020:5238
RHSA-2020:5239 https://access.redhat.com/errata/RHSA-2020:5239
RHSA-2020:5240 https://access.redhat.com/errata/RHSA-2020:5240
RHSA-2020:5257 https://access.redhat.com/errata/RHSA-2020:5257
RHSA-2020:5314 https://access.redhat.com/errata/RHSA-2020:5314
USN-4637-1 https://usn.ubuntu.com/4637-1/
USN-4637-2 https://usn.ubuntu.com/4637-2/
USN-4647-1 https://usn.ubuntu.com/4647-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-26956.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:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26956
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:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26956
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:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26956
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 0.41544
EPSS Score 0.00097
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.