Executive brief
MediaWiki, the software powering Wikipedia and many other wikis, contains a security flaw in how it handles imported data and log entries. An attacker with high-level administrative privileges could potentially execute unauthorized code or manipulate system data by providing specially crafted malicious files. This could lead to a partial loss of data integrity or unauthorized changes to the wiki platform.
Technical details
A deserialization of untrusted data vulnerability (CWE-502) exists in MediaWiki within the WikiImporter, WikiRevision, and LogEntryBase components. The flaw is rooted in the improper handling of serialized objects during import and logging operations, potentially leading to code injection (CWE-94). Exploitation requires network access and high privileges (PR:H), with a high complexity (AC:H) due to the specific conditions needed to trigger the deserialization chain. Successful exploitation allows for partial impact on confidentiality and availability, and high impact on integrity. The issue is addressed in versions 1.46.0, 1.45.4, 1.44.6, and 1.43.9.
Affected products
- Wikimedia Foundation MediaWiki < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9
Timeline
- 2026-07-01: advisory: CVE-2026-58025 published by Wikimedia Foundation