CVE-2024-47913 is a vulnerability affecting the AbuseFilter extension of MediaWiki, a widely used open-source wiki platform. The flaw exists in versions before 1.39.9, 1.40.x, 1.41.x before 1.41.3, and 1.42.x before 1.42.2. AbuseFilter is designed to detect and prevent abusive edits by applying filter conditions and logging related events. The vulnerability allows an API caller to query and match filter conditions against AbuseFilter logs without proper authorization to view the log details. This means that an attacker can remotely access metadata or partial information from AbuseFilter logs that should be restricted, potentially revealing sensitive operational details about abuse detection rules and their triggers. The vulnerability is classified under CWE-532 (Information Exposure Through Log Files), indicating that sensitive information is leaked via logs. The CVSS v3.1 base score is 5.3 (medium), reflecting that the attack vector is network-based, requires no privileges or user interaction, and impacts confidentiality only. No integrity or availability impacts are reported. No patches or exploit code links were provided at the time of disclosure, and no known exploits in the wild have been reported. The issue highlights the importance of strict access control on log data in security extensions to prevent information leakage that could aid attackers in circumventing abuse detection mechanisms.

The primary impact of CVE-2024-47913 is unauthorized disclosure of AbuseFilter log information, which could reveal details about filter conditions and abuse detection activities. This information leakage can assist attackers in understanding how abuse is detected and potentially crafting edits or actions to evade detection. While the vulnerability does not allow modification or disruption of the MediaWiki system, the confidentiality breach can undermine the effectiveness of abuse prevention measures. Organizations relying on MediaWiki for collaborative content management, especially those with sensitive or high-profile content, may face increased risk of targeted abuse or vandalism if attackers leverage leaked log information. The scope is limited to MediaWiki instances using the vulnerable AbuseFilter versions, but given MediaWiki’s widespread use in public and private wikis worldwide, the potential exposure is significant. The lack of authentication requirement and remote exploitability increase the risk, although no active exploitation has been reported. Overall, the impact is moderate but relevant for organizations prioritizing information confidentiality and abuse prevention integrity.

To mitigate CVE-2024-47913, organizations should upgrade the AbuseFilter extension to the fixed versions: 1.39.9 or later, 1.41.3 or later, and 1.42.2 or later, depending on their MediaWiki version branch. If immediate patching is not possible, administrators should restrict API access to trusted users only, implementing strict access controls and network-level restrictions to limit exposure. Reviewing and tightening permissions related to AbuseFilter logs and API endpoints can reduce unauthorized access risk. Monitoring API usage logs for unusual or unauthorized queries targeting AbuseFilter logs is recommended to detect potential exploitation attempts. Additionally, consider disabling or limiting AbuseFilter logging if not essential, to minimize sensitive information exposure. Regularly auditing MediaWiki extensions and applying security updates promptly will help prevent similar vulnerabilities. Finally, educating administrators about the sensitivity of log data and enforcing the principle of least privilege on API access are critical best practices.