Medium severity · published Apr 15, 2023
CVE-2021-30153
An issue was discovered in the VisualEditor extension in MediaWiki before 1.31.13, and 1.32.x through 1.35.x before 1.35.2
4.3
CVSS
0.8%
EPSS
No
On KEV
Description
An issue was discovered in the VisualEditor extension in MediaWiki before 1.31.13, and 1.32.x through 1.35.x before 1.35.2. . When using VisualEditor to edit a MediaWiki user page belonging to an existing, but hidden, user, VisualEditor will disclose that the user exists. (It shouldn't because they are hidden.) This is related to ApiVisualEditor.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Mediawiki · Mediawiki
before 1.31.13; 1.32.0 before 1.35.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30153
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-30153
lists.wikimedia.org
https://lists.wikimedia.org/hyperkitty/list/wikitech-l%40lists.wikimedia.org/message/XYBF5RSTJRMVCP7QBYK7643W75A3KCIY/
Mailing List
https://lists.wikimedia.org/pipermail/wikitech-l/2021-April/094418.html
Exploit
https://phabricator.wikimedia.org/T270453
More from Mediawiki
9.8
CVE-2026-58025
Remote Code Execution via Unsafe Deserialization in LogItem Import
9.8
CVE-2025-67484
Action API xslt option allows JavaScript execution by administrators who are not interface administrators
9.8
CVE-2024-34502
An issue was discovered in WikibaseLexeme in MediaWiki before 1.39.6, 1.40.x before 1.40.2, and 1.41.x before 1.41.1
9.8
CVE-2023-37303
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3
9.8
CVE-2023-29141
An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3