CVE-2026-58025Network attack vector

Authenticated code execution via unsafe log parameter deserialization

Published Jul 1, 2026 · Updated Jul 1, 2026

Unsafe deserialization in affected MediaWiki releases allows remote authenticated users to execute code through imported log entries. LogEntryBase::extractParams() passes imported log_params data to PHP unserialize() without blocking arbitrary object instantiation. The path requires log-entry import permission, and code execution additionally requires a usable object gadget chain.

CVSS severity5.9
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in affected MediaWiki releases allows remote authenticated users to execute code through imported log entries. LogEntryBase::extractParams() passes imported log_params data to PHP unserialize() without blocking arbitrary object instantiation. The path requires log-entry import permission, and code execution additionally requires a usable object gadget chain.

The record

CVE
CVE-2026-58025
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Wikimedia Foundation
Product
MediaWiki
Classifications
CWE-94, CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <1.46.0, 1.45.4, 1.44.6, 1.43.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wikimedia Foundation · MediaWikiversion=* <1.46.0, 1.45.4, 1.44.6, 1.43.9

Published CVSS scores

5.9Wikimedia FoundationCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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