Deserialization of untrusted data vulnerability in Wikimedia Foundation MediaWiki. (CVE-2026-58025)
Description
A deserialization of untrusted data vulnerability exists in Wikimedia Foundation MediaWiki affecting multiple program files. This vulnerability impacts various versions of MediaWiki prior to 1.46.0, including specific older versions. The vulnerability has a high CVSS score of 9.8, indicating critical severity. No explicit patch or remediation details are provided in the input data.
CVSS v3.1
Score 9.8critical
Affected software
pkg:deb/ubuntu/mediawiki?arch=source&distro=bionicpkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/mediawiki?arch=source&distro=questingpkg:deb/ubuntu/mediawiki?arch=source&distro=stonkingpkg:deb/ubuntu/mediawiki?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-58025 is a deserialization of untrusted data vulnerability in Wikimedia Foundation MediaWiki. It affects program files includes/Import/WikiImporter.Php, includes/Import/WikiRevision.Php, and includes/Logging/LogEntryBase.Php. The vulnerability impacts MediaWiki versions prior to 1.46.0, including 1.45.4, 1.44.6, and 1.43.9, as well as multiple other specific versions listed. The CVSS v3.1 base score is 9.8, with vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation could lead to complete compromise of the affected MediaWiki installation, including full confidentiality, integrity, and availability impact. The vulnerability allows an attacker to deserialize untrusted data, which can lead to remote code execution or other severe consequences.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor official MediaWiki advisories for updates and apply patches once available. Until then, restrict access to vulnerable endpoints and consider additional protective controls to mitigate exploitation risk.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58025
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5df2cdf04f656663481
Added to database: 10/17/2026, 22:25:35 UTC
Last enriched: 10/18/2026, 00:33:59 UTC
Last updated: 10/18/2026, 00:33:59 UTC
Views: 3
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