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MediaWiki CVE-2026-58033

| EUVDEUVD-2026-41045 MEDIUM
Information Exposure (CWE-200)
2026-07-01 wikimedia-foundation GHSA-r39h-799c-h846
PHP Information Disclosure Mediawiki
5.3
CVSS 4.0 · Vendor: wikimedia-foundation
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Severity by source

Vendor (wikimedia-foundation) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/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
4.3 MEDIUM

Network-accessible with no privileges required; UI:R reflects the passive user interaction indicated by CVSS 4.0 UI:P; confidentiality impact is Low with no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/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:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/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
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 17:01 EUVD
Analysis Generated
Jul 01, 2026 - 16:02 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/Actions/InfoAction.Php.

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

AnalysisAI

Sensitive information exposure in MediaWiki's InfoAction.php allows unauthenticated remote actors to obtain restricted page metadata through the 'Info' action endpoint. All MediaWiki versions before 1.46.0, 1.45.4, 1.44.6, and 1.43.9 are affected across all deployment configurations. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify MediaWiki instance via HTTP
Delivery
Append '?action=info' to target page URL
Exploit
Trigger unguarded InfoAction.php handler
Execution
Retrieve sensitive page metadata
Impact
Aggregate across multiple pages for reconnaissance
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target MediaWiki instance is network-reachable and running a version prior to 1.46.0, 1.45.4, 1.44.6, or 1.43.9. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N) scores 5.3, reflecting a moderate-severity information disclosure with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated actor navigates to a MediaWiki instance and appends '?action=info' to any wiki page URL, triggering InfoAction.php to render page metadata that should be access-controlled. With no special tools required and low attack complexity, an actor can enumerate multiple page endpoints to harvest internal metadata - such as watcher counts or contributor lists - that reveals organizational activity patterns on private or semi-private wikis. …
Remediation The primary fix is to upgrade MediaWiki to one of the patched releases: 1.46.0, 1.45.4, 1.44.6, or 1.43.9, depending on the branch in use. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-58033 vulnerability details – vuln.today
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