CVE-2025-61643 is a vulnerability identified in the MediaWiki software maintained by the Wikimedia Foundation. The issue resides in the file includes/recentchanges/RecentChangeRCFeedNotifier.php and affects all versions prior to 1.39.14, 1.43.4, and 1.44.1. MediaWiki is a widely used open-source wiki platform powering numerous knowledge bases, including Wikipedia. The vulnerability has a CVSS 4.0 base score of 2.7, categorized as low severity. The vector indicates that the vulnerability can be exploited remotely (AV:N) without authentication (PR:N) or user interaction (UI:N), but it only results in a low confidentiality impact (VC:L) and no impact on integrity or availability. The exact nature of the vulnerability is not detailed in the provided information, but given the file involved, it likely relates to how recent changes notifications are handled, potentially exposing limited information or causing minor information disclosure. No known exploits are reported in the wild, and no patches have been explicitly linked, though affected versions are clearly identified. The vulnerability does not appear to allow privilege escalation or remote code execution, limiting its potential impact. This suggests the issue is more informational or related to minor data leakage rather than a critical security flaw.

For European organizations using MediaWiki, the impact of CVE-2025-61643 is expected to be minimal due to its low severity score and limited confidentiality impact. The vulnerability does not affect system integrity or availability, reducing the risk of operational disruption or data tampering. However, organizations that rely on MediaWiki for internal knowledge management or public information dissemination could face minor information disclosure risks if the vulnerability is exploited. This could potentially expose metadata or recent changes information that might be sensitive in certain contexts. Given the lack of known exploits and the low severity, the threat does not currently represent a significant risk to European enterprises or government entities. Nonetheless, organizations with strict data privacy requirements or those operating in sensitive sectors should remain vigilant. The widespread use of MediaWiki in educational institutions, public administrations, and research organizations across Europe means that even low-severity vulnerabilities warrant timely remediation to maintain trust and compliance with data protection regulations such as GDPR.

Organizations should proactively monitor official Wikimedia Foundation communications for patches addressing CVE-2025-61643 and apply updates to MediaWiki as soon as they become available. Until patches are released, administrators can mitigate risk by restricting access to the affected RecentChangeRCFeedNotifier.php functionality, for example, by limiting access to trusted users or internal networks only. Implementing web application firewalls (WAFs) with rules tailored to detect unusual requests targeting the recent changes feed may help reduce exploitation attempts. Regularly auditing MediaWiki configurations and logs for suspicious activity related to recent changes notifications can provide early detection of exploitation attempts. Additionally, organizations should ensure that MediaWiki installations are running supported and updated versions, and consider isolating MediaWiki instances from critical infrastructure to minimize potential impact. Security teams should integrate this vulnerability into their vulnerability management processes and conduct risk assessments specific to their deployment context.