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CVE-2026-39934— Growth Experiments ReassignMenteesJob runs as an infinite loop

Quick assessment

Affected
The Wikimedia Foundation Mediawiki - GrowthExperiments 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 - GrowthExperiments Extension是MediaWiki开源的一个插件。 Mediawiki - GrowthExperiments Extension 1.45.2版本、1.44.4版本和1.43.7版本存在安全漏洞，该漏洞源于存在不可达退出条件的循环，可能导致利用TOCTOU竞争条件。

AI Predicted 5.9 Difficulty: Hard EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1047 · Windows Management Instrumentation
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I. Basic Information for CVE-2026-39934

Vulnerability Information
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Vulnerability Title
Growth Experiments ReassignMenteesJob runs as an infinite loop
Source: CVE Program / CVE List V5
Vulnerability Description
Loop with unreachable exit condition ('infinite loop') vulnerability in The Wikimedia Foundation Mediawiki - GrowthExperiments Extension allows Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions. This issue was remediated only on the `master` branch.
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
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
MediaWiki - GrowthExperiments Extension 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MediaWiki - GrowthExperiments Extension是MediaWiki开源的一个插件。 Mediawiki - GrowthExperiments Extension 1.45.2版本、1.44.4版本和1.43.7版本存在安全漏洞，该漏洞源于存在不可达退出条件的循环，可能导致利用TOCTOU竞争条件。
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 - GrowthExperiments Extension 1.45.2 -

II. Public POCs for CVE-2026-39934

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III. Intelligence Information for CVE-2026-39934

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Patches & Fixes for CVE-2026-39934 (1)

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

CVE-2026-22711 Stored XSS through system messages in WikiLove
CVE-2026-39937 Global vanishing does not completely remove user email
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 - GrowthExperiments Extension
Same vendor: The Wikimedia Foundation
Same weakness: CWE-835

V. Comments for CVE-2026-39934

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