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CVE-2026-39937— Global vanishing does not completely remove user email

Quick assessment

Affected
The Wikimedia Foundation Mediawiki - CentralAuth 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.

MediaWiki - CentralAuth Extension是MediaWiki开源的一个认证插件。 MediaWiki - CentralAuth Extension存在安全漏洞，该漏洞源于存储或传输前未正确移除敏感信息，可能导致资源泄露暴露。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.45% · P36

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-39937

Vulnerability Information
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Vulnerability Title
Global vanishing does not completely remove user email
Source: CVE Program / CVE List V5
Vulnerability Description
Improper removal of sensitive information before storage or transfer vulnerability in The Wikimedia Foundation Mediawiki - CentralAuth Extension allows Resource Leak Exposure. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的不恰当跨边界移除
Source: CVE Program / CVE List V5
Vulnerability Title
MediaWiki - CentralAuth Extension 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MediaWiki - CentralAuth Extension是MediaWiki开源的一个认证插件。 MediaWiki - CentralAuth Extension存在安全漏洞，该漏洞源于存储或传输前未正确移除敏感信息，可能导致资源泄露暴露。
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 - CentralAuth Extension - -

II. Public POCs for CVE-2026-39937

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III. Intelligence Information for CVE-2026-39937

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Same Patch Batch · The Wikimedia Foundation · 2026-04-07 · 6 CVEs total

CVE-2026-22711 Stored XSS through system messages in WikiLove
CVE-2026-39934 Growth Experiments ReassignMenteesJob runs as an infinite loop
CVE-2026-39933 Multiple XSS vulnerabilities in GlobalWatchlist
CVE-2026-39936 Stored XSS in Score due to usage of non-reserved data attributes
CVE-2026-39935 XSS-via-i18n in localised wiki names

IV. Related Vulnerabilities

Same product: Mediawiki - CentralAuth Extension
Same vendor: The Wikimedia Foundation
Same weakness: CWE-212

V. Comments for CVE-2026-39937

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