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Vulnerability details: VCID-jy7q-ce2g-dbgs
Vulnerability ID VCID-jy7q-ce2g-dbgs
Aliases CVE-2020-12391
Summary Documents formed using data: URLs in an object element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-358 Improperly Implemented Security Check for Standard
CWE-863 Incorrect Authorization
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12391.json
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
epss 0.00693 https://api.first.org/data/v1/epss?cve=CVE-2020-12391
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-12391
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-12391
archlinux Critical https://security.archlinux.org/AVG-1148
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-16
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12391.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12391
https://bugzilla.mozilla.org/show_bug.cgi?id=1457100
https://www.mozilla.org/security/advisories/mfsa2020-16/
1834687 https://bugzilla.redhat.com/show_bug.cgi?id=1834687
ASA-202005-3 https://security.archlinux.org/ASA-202005-3
AVG-1148 https://security.archlinux.org/AVG-1148
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:*:*:*:*:*:*:*:*
CVE-2020-12391 https://nvd.nist.gov/vuln/detail/CVE-2020-12391
mfsa2020-16 https://www.mozilla.org/en-US/security/advisories/mfsa2020-16
USN-4353-1 https://usn.ubuntu.com/4353-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12391.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: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12391
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:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12391
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 0.70949
EPSS Score 0.00693
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:39.906016+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-16.yml 37.0.0