Information disclosure in MediaWiki - CVE-2021-31545
Published: April 26, 2021
Vulnerability identifier: #VU52567
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-31545
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists in the AbuseFilter extension due to the page_recent_contributors leaked the existence of certain deleted MediaWiki usernames, related to rev_deleted. A remote attacker can gain unauthorized access to sensitive information on the system.
Affected software
MediaWiki
How to mitigate CVE-2021-31545
Install updates from vendor's website.
MediaWiki - addressed in versions 1.31.13, 1.35.2