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Vulnerability details: VCID-y2yr-dgph-z3hj
Vulnerability ID VCID-y2yr-dgph-z3hj
Aliases CVE-2020-26967
Summary When listening for page changes with a Mutation Observer, a malicious web page could confuse Firefox Screenshots into interacting with elements other than those that it injected into the page. This would lead to internal errors and unexpected behavior in the Screenshots code.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2020-26967
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-26967
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-26967
archlinux Critical https://security.archlinux.org/AVG-1279
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-26967
https://bugzilla.mozilla.org/show_bug.cgi?id=1665820
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-50/
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:*:*:*:*:*:*:*:*
CVE-2020-26967 https://nvd.nist.gov/vuln/detail/CVE-2020-26967
mfsa2020-50 https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
USN-4637-1 https://usn.ubuntu.com/4637-1/
USN-4637-2 https://usn.ubuntu.com/4637-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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-2020-26967
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:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26967
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 0.51478
EPSS Score 0.00284
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:43.891067+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-50.yml 37.0.0