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MediaWiki EUVDEUVD-2026-41024

| CVE-2026-58026 NONE
Information Exposure (CWE-200)
2026-07-01 wikimedia-foundation GHSA-jp4p-rf6v-wv5p
PHP Information Disclosure Mediawiki

Severity by source

Vendor (wikimedia-foundation) PRIMARY
0.0 NONE
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
vuln.today AI
3.5 LOW

Network-accessible parser flaw requiring authenticated low-privilege user and interaction; limited confidentiality impact only, no integrity or availability consequence.

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

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P

Lifecycle Timeline

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

DescriptionCVE.org

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki.

This vulnerability is associated with program files includes/Parser/Parser.Php.

This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

AnalysisAI

Information disclosure in MediaWiki's core parser component (includes/Parser/Parser.php) allows authenticated low-privilege users, under conditions requiring user interaction, to obtain sensitive information not intended for their access level. All MediaWiki branches are affected up to versions 1.43.9, 1.44.6, 1.45.4, and 1.46.0, covering a broad installation base including self-hosted wikis worldwide. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege MediaWiki account
Delivery
Craft wikitext payload targeting Parser.php
Exploit
Save or link payload to a wiki page
Execution
Trigger page render (attacker or victim interaction)
Persist
Parser exposes sensitive information in rendered output
Impact
Attacker reads disclosed data
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Vulnerability AssessmentAI

Exploitation Exploitation requires a low-privilege authenticated MediaWiki account (CVSS PR:L confirmed). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N) presents an internal contradiction: all vulnerable-system and subsequent-system impact metrics are scored None, which mathematically yields a base score of 0.0, yet the vulnerability is classified as CWE-200 information disclosure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated user with a basic wiki account crafts a wikitext payload - such as a template invocation or parser function call - and saves or links to a page containing it. When the page is rendered by Parser.php, the vulnerability causes sensitive information (such as internal configuration values, restricted template content, or data from other page contexts) to appear in the rendered output visible to that user. …
Remediation Upgrade MediaWiki to the appropriate patched release for your active branch: 1.43.9, 1.44.6, 1.45.4, or 1.46.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-41024 vulnerability details – vuln.today
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