Deserialization Flaw in MediaWiki

Publication date: 2026-07-01

Last updated on: 2026-07-09

Assigner: wikimedia-foundation

Description

Deserialization of untrusted data vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Import/WikiImporter.Php, includes/Import/WikiRevision.Php, includes/Logging/LogEntryBase.Php. This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-01

Last Modified

2026-07-09

Generated

2026-07-21

AI Q&A

2026-07-01

EPSS Evaluated

2026-07-20

NVD

CVE-2026-58025

EUVD

EUVD-2026-41031

Affected Vendors & Products

Vendor	Product	Version / Range
mediawiki	mediawiki	From 1.44.0 (inc) to 1.44.6 (exc)
mediawiki	mediawiki	From 1.45.0 (inc) to 1.45.4 (exc)
mediawiki	mediawiki	From 1.43.0 (inc) to 1.43.9 (exc)
mediawiki	mediawiki	1.46.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Executive Summary

This vulnerability is a deserialization of untrusted data issue found in the Wikimedia Foundation's MediaWiki software. It involves certain program files such as includes/Import/WikiImporter.Php, includes/Import/WikiRevision.Php, and includes/Logging/LogEntryBase.Php. The vulnerability affects versions of MediaWiki before 1.46.0, including 1.45.4, 1.44.6, and 1.43.9.

Impact Analysis

The vulnerability allows deserialization of untrusted data, which can lead to security risks such as unauthorized code execution, data corruption, or other malicious actions depending on how the deserialized data is handled. Given the CVSS base score of 5.9, it represents a moderate severity risk that could impact the confidentiality, integrity, or availability of the affected MediaWiki installation.

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