CVSS 3.1 Score 6.5 of 10 (medium)


Published Oct 9, 2023
Updated: Oct 12, 2023


CVE-2023-45367 is a vulnerability found in the CheckUser extension for MediaWiki versions prior to 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. This vulnerability allows an attacker to use a specific URL to store an unlimited number of rows, leading to a denial of service (DoS) attack. The affected products include various versions of Xz2hff, Xz2hfe, Xz2hf_, and others listed in the text. To remediate this vulnerability, it is recommended to update MediaWiki to version 1.35.12, 1.39.5, or 1.40.1 depending on the installed version branch being used by the organization's system and review access controls for the CheckUser extension API to prevent misuse or unauthorized access attempts. The potential danger posed by this vulnerability is a DoS attack that can disrupt the availability of the affected organization's MediaWiki instance, potentially causing operational disruptions and impacting user experience.

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