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MediaWiki CVE-2026-58029

| EUVDEUVD-2026-41030 MEDIUM
Improper Authentication (CWE-287)
2026-07-01 wikimedia-foundation GHSA-gpg7-6j8p-9wg5
PHP Mediawiki Authentication Bypass
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:L/VA:N/SC:L/SI:L/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
6.1 MEDIUM

Network-accessible auth endpoints require passive user interaction; scope changed to C due to subsequent-system impact (SC:L/SI:L in 4.0); no availability impact observed.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:L/VA:N/SC:L/SI:L/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 - 16:04 vuln.today

DescriptionCVE.org

Vulnerability in Wikimedia Foundation MediaWiki.

This vulnerability is associated with program files includes/Api/ApiChangeAuthenticationData.Php, includes/Api/ApiLinkAccount.Php, includes/Api/ApiRemoveAuthenticationData.Php, includes/Specials/SpecialLinkAccounts.Php, includes/Specials/SpecialUnlinkAccounts.Php.

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

AnalysisAI

Authentication API endpoints and Special pages in MediaWiki expose low-severity confidentiality and integrity weaknesses exploitable by unauthenticated remote attackers who can induce victim user interaction. Five files spanning account-linking and credential management operations - ApiChangeAuthenticationData, ApiLinkAccount, ApiRemoveAuthenticationData, SpecialLinkAccounts, and SpecialUnlinkAccounts - are affected across all MediaWiki releases prior to the fixed branches 1.43.9, 1.44.6, 1.45.4, and the forthcoming 1.46.0. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious link targeting auth API or Special page
Delivery
Distribute link via phishing or embedded content
Exploit
Victim user visits or clicks link
Execution
Affected authentication endpoint processes unauthenticated request
Impact
Limited credential data disclosed or account-linking state modified
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Vulnerability AssessmentAI

Exploitation Exploitation requires passive user interaction (UI:P per CVSS 4.0): the victim must visit a crafted URL or interact with attacker-controlled content that causes their browser to contact one of the five affected endpoints. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.3 (Medium) is derived from a vector of AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a page or distributes a crafted URL that triggers one of the affected authentication API endpoints or Special pages when a MediaWiki user visits or interacts with it. Upon victim interaction, the vulnerable endpoint discloses limited authentication-related data or permits a minor manipulation of account-linking state, potentially enabling the attacker to enumerate partial credential information or interfere with the victim's external account associations. …
Remediation The primary remediation is to upgrade MediaWiki to a patched release: version 1.43.9, 1.44.6, or 1.45.4 depending on the deployed branch, or to 1.46.0 upon its release. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-58029 vulnerability details – vuln.today
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