{"id":59373,"date":"2025-07-14T10:03:04","date_gmt":"2025-07-14T10:03:04","guid":{"rendered":""},"modified":"2025-09-06T11:54:47","modified_gmt":"2025-09-06T17:54:47","slug":"cve-2025-53495-unauthorized-access-data-leakage-in-wikimedia-foundation-mediawiki-abusefilter-extension","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53495-unauthorized-access-data-leakage-in-wikimedia-foundation-mediawiki-abusefilter-extension\/","title":{"rendered":"CVE-2025-53495: Unauthorized Access & Data Leakage in Wikimedia Foundation Mediawiki – AbuseFilter Extension<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-53495 is a critical vulnerability that lies in the heart of the Wikimedia Foundation’s Mediawiki – AbuseFilter Extension. This vulnerability paves the way for unauthorized access and data leakage, posing a significant threat to the confidentiality, integrity, and availability of systems running the affected versions of the Mediawiki – AbuseFilter Extension. As the extension is widely utilised in the Wikimedia ecosystem, this vulnerability warrants immediate attention and prompt remediation.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-53495
\nSeverity: Critical, CVSS Severity Score: 9.1
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Unauthorized access to systems and potential data<\/a> leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Mediawiki – AbuseFilter<\/a> Extension | 1.43.X before 1.43.2<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit takes advantage of a missing authorization vulnerability<\/a> in the Mediawiki – AbuseFilter Extension. It allows an attacker to bypass the authorization mechanisms, granting them unauthorized access<\/a> to the system. This could potentially be used to compromise the system<\/a> or to extract sensitive information, leading to data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

While the specifics of the exploit are not disclosed to maintain security<\/a>, here’s a conceptual example of how the vulnerability might be exploited using an HTTP request:<\/p>\n

GET \/mediawiki\/AbuseFilterExtension\/endpoint HTTP\/1.1\nHost: target.example.com\n{ \"user_credentials\": \"None\", \"access_level\": \"admin\" }<\/code><\/pre>\n
In this example, an attacker sends a GET request to the vulnerable<\/a> endpoint, specifying no user credentials but requesting admin-level access. Due to the missing authorization vulnerability, the system fails to properly validate the request, thereby granting the attacker unauthorized access<\/a>.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
To protect systems against this vulnerability<\/a>, users are advised to apply the official patch provided by the vendor. This patch upgrades the Mediawiki – AbuseFilter Extension to version 1.43.2, which has remedied the missing authorization vulnerability<\/a>. As a temporary mitigation measure, users can also implement a Web Application<\/a> Firewall (WAF) or an Intrusion Detection System (IDS) to monitor and block suspicious activity. However, users are strongly encouraged to apply the vendor patch as soon as possible to ensure maximum protection.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-53495 is a critical vulnerability that lies in the heart of the Wikimedia Foundation’s Mediawiki – AbuseFilter Extension. This vulnerability paves the way for unauthorized access and data leakage, posing a significant threat to the confidentiality, integrity, and availability of systems running the affected versions of the Mediawiki – AbuseFilter Extension. As the extension […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-59373","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t