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CVE-2026-58517— Blocked users can create and edit WikiLambda objects

Quick assessment

Affected
The Wikimedia Foundation Mediawiki - WikiLambda Extension
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wikimedia Mediawiki - WikiLambda Extension是美国Wikimedia基金会的一款WikiLambda扩展模块。 Wikimedia Mediawiki - WikiLambda Extension存在授权问题漏洞，该漏洞源于输入终结符中和不当，可能导致身份验证绕过。以下版本受到影响：1.43.9之前版本、1.44.6之前版本和1.45.4之前版本。

AI Predicted 9.1 Difficulty: Easy EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Wikimedia Foundation Mediawiki - WikiLambda Extension *< 1.43.9,1.44.6,1.45.4 affected
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I. Basic Information for CVE-2026-58517

Vulnerability Information
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Vulnerability Title
Blocked users can create and edit WikiLambda objects
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass. This issue affects Mediawiki - WikiLambda Extension: from * before 1.43.9,1.44.6,1.45.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Wikimedia Mediawiki - WikiLambda Extension 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wikimedia Mediawiki - WikiLambda Extension是美国Wikimedia基金会的一款WikiLambda扩展模块。 Wikimedia Mediawiki - WikiLambda Extension存在授权问题漏洞，该漏洞源于输入终结符中和不当，可能导致身份验证绕过。以下版本受到影响：1.43.9之前版本、1.44.6之前版本和1.45.4之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Wikimedia Foundation Mediawiki - WikiLambda Extension * ~ 1.43.9,1.44.6,1.45.4 -

II. Public POCs for CVE-2026-58517

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III. Intelligence Information for CVE-2026-58517

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Patches & Fixes for CVE-2026-58517 (2)

Same Patch Batch · The Wikimedia Foundation · 2026-07-01 · 7 CVEs total

CVE-2026-58520 UrlShortener defaults to ineffective validation open to third-party redirects
CVE-2026-58518 Wikimedia Foundation Mediawiki - RedirectManager Extension 跨站请求伪造漏洞
CVE-2026-58521 SQLi in Cargo extension via year range filter
CVE-2026-58519 Stored XSS through Cargo's map format
CVE-2026-14363 Cargo Extension: SQLi in Special:Drilldown
CVE-2026-14358 Stored XSS in Wikimedia Chart pie tooltip via Data:*.tab field title

IV. Related Vulnerabilities

Same product: Mediawiki - WikiLambda Extension
Same vendor: The Wikimedia Foundation
Same weakness: CWE-288

V. Comments for CVE-2026-58517

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