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Vulnerability details: VCID-h853-1syx-g7he
Vulnerability ID VCID-h853-1syx-g7he
Aliases CVE-2021-30458
GHSA-5pqx-77vf-85rw
Summary Wikimedia Parsoid vulnerable to Cross-site Scripting (XSS) An issue was discovered in Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2. An attacker can send crafted wikitext that Utils/WTUtils.php will transform by using a <meta> tag, bypassing sanitization steps, and potentially allowing for XSS.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
epss 0.00214 https://api.first.org/data/v1/epss?cve=CVE-2021-30458
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-5pqx-77vf-85rw
cvssv3.1 6.1 https://github.com/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.yaml
cvssv3.1 6.1 https://github.com/wikimedia/mediawiki-services-parsoid
generic_textual MODERATE https://github.com/wikimedia/mediawiki-services-parsoid
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-30458
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-30458
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-30458
cvssv3.1 6.1 https://phabricator.wikimedia.org/T279451
generic_textual MODERATE https://phabricator.wikimedia.org/T279451
archlinux Medium https://security.archlinux.org/AVG-1775
cvssv3.1 6.1 https://security.gentoo.org/glsa/202107-40
generic_textual MODERATE https://security.gentoo.org/glsa/202107-40
cvssv3.1 6.1 https://www.mediawiki.org/wiki/Parsoid
generic_textual MODERATE https://www.mediawiki.org/wiki/Parsoid
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-30458
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30458
https://github.com/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.yaml
https://github.com/wikimedia/mediawiki-services-parsoid
https://nvd.nist.gov/vuln/detail/CVE-2021-30458
https://phabricator.wikimedia.org/T279451
https://security.gentoo.org/glsa/202107-40
https://www.mediawiki.org/wiki/Parsoid
AVG-1775 https://security.archlinux.org/AVG-1775
cpe:2.3:a:wikimedia:parsoid:*:*:*:*:*:node.js:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:wikimedia:parsoid:*:*:*:*:*:node.js:*:*
GHSA-5pqx-77vf-85rw https://github.com/advisories/GHSA-5pqx-77vf-85rw
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.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: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/wikimedia/mediawiki-services-parsoid
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-2021-30458
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-2021-30458
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://phabricator.wikimedia.org/T279451
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://security.gentoo.org/glsa/202107-40
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://www.mediawiki.org/wiki/Parsoid
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 0.44115
EPSS Score 0.00214
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:16:32.296980+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-5pqx-77vf-85rw/GHSA-5pqx-77vf-85rw.json 37.0.0