Deserialization of Untrusted Data Vulnerability in Wikimedia MediaWiki
CVE-2026-58025

5.9MEDIUM

Key Information:

Vendor

Wikimedia Foundation

Status
Mediawiki
Vendor
CVE Published:
1 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-58025?

A deserialization of untrusted data vulnerability has been identified in Wikimedia Foundation's MediaWiki, particularly linked to components such as includes/Import/WikiImporter.Php, includes/Import/WikiRevision.Php, and includes/Logging/LogEntryBase.Php. This issue allows potential attackers to manipulate objects during deserialization, which could lead to unauthorized operations and loss of integrity within the application. Systems running versions earlier than 1.46.0, including 1.45.4, 1.44.6, and 1.43.9, are particularly at risk and should be updated to mitigate potential exploitation.

Affected Version(s)

MediaWiki * < 1.46.0, 1.45.4, 1.44.6, 1.43.9

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-58025
Created by shinthink

References

https://phabricator.wikimedia.org/T422244

CVSS V4

Score:
5.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.