Vulnerability in Wikimedia Foundation Mediawiki - GrowthExperiments Extension (CVE-2026-39934)
Summary
Vulnerability in Wikimedia Foundation Mediawiki - GrowthExperiments Extension (CVE-2026-39934). Risk of unauthorized operations or information disclosure. Exploitable via master.
Original description
The description as published by the source.
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: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-39934 has been found in Wikimedia Foundation Mediawiki - GrowthExperiments Extension.
Attackers can target a specific entry point like master over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Wikimedia Foundation Mediawiki - GrowthExperiments Extension CVE-2026-39934" on the vendor's site.
CVE-2026-39934 (Wikimedia Foundation Mediawiki - GrowthExperiments Extension) — CWE-835
Attack surface: master
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-835) exists in Wikimedia Foundation Mediawiki - GrowthExperiments Extension. Attackers reach the vulnerable code path via master.
Check the vendor advisory for the affected versions of Wikimedia Foundation Mediawiki - GrowthExperiments Extension. Attack surface: master.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Wikimedia Foundation Mediawiki - GrowthExperiments Extension を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。