CVE-2020-25814 json
MediaWiki Cross-site Scripting (XSS) vulnerability
published 2020-09-27 6 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2020-25814 , EUVD-2022-2452 , GHSA-4vr7-m8p8-434h
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 71%
- public exploits
- 0
- none known
Summary
In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, XSS related to jQuery can occur. The attacker creates a message with [javascript:payload xss] and turns it into a jQuery object with mw.message().parse(). The expected result is that the jQuery object does not contain an <a> tag (or it does not have a href attribute, or it's empty, etc.). The actual result is that the object contains an <a href ="javascript... that executes when clicked.
Patch / fix
- packagist mediawiki/core 1.31.9, 1.34.3, 1.35.0
- bitnami mediawiki 1.31.10, 1.34.4
- mediawiki mediawiki 1.31.10, 1.34.4
- mediawiki Debian 14, Debian 13, Debian 12 1:1.35.0-1
debian advisories DEBIAN-CVE-2020-25814
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-25814 updated cvss 6.1
mediawiki: XSS via javascript:payload
-
Red Hat OpenShift Container Platform 3.11 mediawikiaffected: no fix planned “Will not fix”
-
Red Hat OpenShift Container Platform 4 mediawikiaffected: no fix planned “Out of support scope”
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | mediawiki/core | >=1.31.0, <1.31.9 >=1.32.0, <1.34.3 >=1.35.0-rc.0, <1.35.0 |
1.31.9 1.34.3 1.35.0 |
| bitnami | mediawiki | <1.31.10 >=1.32.0, <1.34.4 |
1.31.10 1.34.4 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
vendor-advisory, web
-
mediawiki.org
/wiki/ResourceLoader/Core_modules#mediawiki.jqueryMsg
web, vendor-advisory
-
lists.wikimedia.org
/pipermail/mediawiki-l/2020-September/048480.html
web, mailing-list, release-notes, vendor-advisory
-
lists.wikimedia.org
/pipermail/mediawiki-l/2020-September/048488.html
web, mailing-list, release-notes, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-25814
advisory, web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/mediawiki/core/CVE-2020-25814.yaml
web
-
github.com
/wikimedia/mediawiki
package
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6
web
-
phabricator.wikimedia.org
/T86738
web
Sources
- CVE List CVE-2020-25814
- GitHub Advisory GHSA-4vr7-m8p8-434h
- NVD CVE-2020-25814
- OSV BIT-mediawiki-2020-25814
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