Wikimedia MediaWiki up to 1.43.6/1.44.3/1.45.1 information disclosure

Summaryinfo

A vulnerability labeled as problematic has been found in Wikimedia MediaWiki up to 1.43.6/1.44.3/1.45.1. This issue affects some unknown processing. The manipulation results in information disclosure. This vulnerability is reported as CVE-2026-34088. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Wikimedia MediaWiki up to 1.43.6/1.44.3/1.45.1. It has been classified as problematic. Affected is an unknown part. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

The advisory is shared for download at phabricator.wikimedia.org. This vulnerability is traded as CVE-2026-34088 since 03/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 321929 (Debian dla-4640 : mediawiki - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.43.7, 1.44.4 or 1.45.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (321929). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Wikimedia

Name

• MediaWiki

Version

• 1.43.0
• 1.43.1
• 1.43.2
• 1.43.3
• 1.43.4
• 1.43.5
• 1.43.6
• 1.44.0
• 1.44.1
• 1.44.2
• 1.44.3
• 1.45.0
• 1.45.1

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Exploitinginfo

Threat Intelligenceinfo

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Timelineinfo

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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