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Vulnerability details: VCID-2tm2-vez4-9uaf
Vulnerability ID VCID-2tm2-vez4-9uaf
Aliases CVE-2020-25812
GHSA-rj9p-8jxj-2ch4
Summary MediaWiki Cross-site Scripting (XSS) vulnerability An issue was discovered in MediaWiki 1.34.x before 1.34.3. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.
Status Published
Exploitability None
Weighted Severity None
Risk None
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
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-25812.json
epss 0.00358 https://api.first.org/data/v1/epss?cve=CVE-2020-25812
cvssv3.1 6.1 https://gerrit.wikimedia.org/g/mediawiki/core/+/ad4a3ba45fb955aa8c0eb3c83809b16b40a498b9/includes/specials/SpecialContributions.php#592
generic_textual MODERATE https://gerrit.wikimedia.org/g/mediawiki/core/+/ad4a3ba45fb955aa8c0eb3c83809b16b40a498b9/includes/specials/SpecialContributions.php#592
cvssv3.1 6.1 https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25812.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25812.yaml
cvssv3.1 6.1 https://github.com/wikimedia/mediawiki
generic_textual MODERATE https://github.com/wikimedia/mediawiki
cvssv3.1 6.1 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6
generic_textual MODERATE https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6
cvssv3.1 6.1 https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
generic_textual MODERATE https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
cvssv3.1 6.1 https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
generic_textual MODERATE https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2020-25812
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-25812
cvssv3.1 6.1 https://phabricator.wikimedia.org/T255918
generic_textual MODERATE https://phabricator.wikimedia.org/T255918
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-25812.json
https://api.first.org/data/v1/epss?cve=CVE-2020-25812
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15005
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17367
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17368
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25812
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25813
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25814
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25827
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25828
https://gerrit.wikimedia.org/g/mediawiki/core/+/ad4a3ba45fb955aa8c0eb3c83809b16b40a498b9/includes/specials/SpecialContributions.php#592
https://github.com/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25812.yaml
https://github.com/wikimedia/mediawiki
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
https://nvd.nist.gov/vuln/detail/CVE-2020-25812
https://phabricator.wikimedia.org/T255918
1903767 https://bugzilla.redhat.com/show_bug.cgi?id=1903767
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://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-25812.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://gerrit.wikimedia.org/g/mediawiki/core/+/ad4a3ba45fb955aa8c0eb3c83809b16b40a498b9/includes/specials/SpecialContributions.php#592
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/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25812.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

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none

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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
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

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6
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://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
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://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
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-2020-25812
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/T255918
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 0.57257
EPSS Score 0.00358
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:29:55.552188+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-rj9p-8jxj-2ch4/GHSA-rj9p-8jxj-2ch4.json 36.1.3