Improper access control in MediaWiki - CVE-2025-6590
Published: August 7, 2025
Vulnerability identifier: #VU113744
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-6590
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper validation of the usernames. A logged-out user can reveal hidden page contents through transclusion, e.g., "{{:Private page}}".
Affected software
MediaWiki
Debian Linux
mediawiki (Debian package)
Debian Linux
mediawiki (Debian package)
How to mitigate CVE-2025-6590
Install updates from vendor's website.
MediaWiki - addressed in versions 1.39.13, 1.42.7, 1.43.2
mediawiki (Debian package) - update to 1:1.39.13-1~deb12u1
mediawiki (Debian package) - update to 1:1.39.13-1~deb12u1