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MediaWiki CVE-2026-58025

| EUVDEUVD-2026-41031 MEDIUM
Deserialization of Untrusted Data (CWE-502)
2026-07-01 wikimedia-foundation GHSA-28rr-rpqp-g8c8
Deserialization PHP Mediawiki
5.9
CVSS 4.0 · Vendor: wikimedia-foundation
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Severity by source

Vendor (wikimedia-foundation) PRIMARY
5.9 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.2 HIGH

PR:H required for import privileges; AC:H for gadget-chain crafting; S:C because PHP deserialization can affect the underlying server beyond the MediaWiki application boundary.

3.1 AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:H/A:L
4.0 AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 17:01 EUVD
Analysis Generated
Jul 01, 2026 - 16:05 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Deserialization of untrusted data in MediaWiki's wiki import subsystem and logging infrastructure exposes installations to PHP object injection, with high integrity impact on affected systems. Specifically, the WikiImporter, WikiRevision, and LogEntryBase components process attacker-controlled serialized data without sufficient validation, allowing a high-privileged authenticated user to trigger unintended object instantiation or code execution paths. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain high-privilege MediaWiki import credentials
Delivery
Craft XML import file with serialized PHP gadget chain
Exploit
Submit malicious file via Special:Import
Execution
WikiImporter/WikiRevision deserializes payload
Persist
PHP object injection triggers unintended class instantiation
Impact
Achieve high-integrity data manipulation or code execution on server
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated MediaWiki account holding high-privilege import permissions - specifically membership in the 'import' or 'importupload' user groups, which are not granted to standard MediaWiki users by default and must be explicitly assigned by a bureaucrat or sysop. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.9 with vector AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L reflects a vulnerability with meaningful integrity impact but substantially constrained real-world exploitability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A malicious or compromised MediaWiki administrator with import privileges crafts a wiki XML export file containing embedded serialized PHP objects targeting a viable gadget chain within the MediaWiki codebase or its installed PHP dependencies. The attacker uploads this file via Special:Import; WikiImporter.php processes the file and WikiRevision.php reconstructs revision data, triggering deserialization of the malicious payload and allowing the attacker to manipulate application state or achieve code execution on the server. …
Remediation Upgrade MediaWiki to the appropriate patched release for your branch: 1.43.9 (for 1.43.x deployments), 1.44.6 (for 1.44.x), 1.45.4 (for 1.45.x), or 1.46.0 (for main/1.46.x), as confirmed by the vendor at https://phabricator.wikimedia.org/T422244. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-58025 vulnerability details – vuln.today
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