Medium severity · published Oct 9, 2023
CVE-2023-45367
An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1
6.5
CVSS
0.7%
EPSS
No
On KEV
Description
An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Mediawiki · Mediawiki
before 1.35.12; 1.36.0 before 1.39.5; 1.40.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-45367
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-45367
Exploit
https://phabricator.wikimedia.org/T344923
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