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CVE-2026-100242— DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memory exhaustion)

Quick assessment

Affected
Wikimedia Foundation Mediawiki - DataTransfer 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.

Dependency on Vulnerable Third-Party Component and Uncontrolled Resource Consumption vulnerability in Wikimedia Foundation Mediawiki - DataTransfer Extension allows Excessive Allocation. This issue affects Mediawiki - DataTransfer Extension: from 1.46.0 before

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I. Basic Information for CVE-2026-100242

Vulnerability Information

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Vulnerability Title
DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memory exhaustion)
Source: CVE Program / CVE List V5
Vulnerability Description
Dependency on Vulnerable Third-Party Component and Uncontrolled Resource Consumption vulnerability in Wikimedia Foundation Mediawiki - DataTransfer Extension allows Excessive Allocation. This issue affects Mediawiki - DataTransfer Extension: from 1.46.0 before 1.47.0.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1395
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wikimedia Foundation Mediawiki - DataTransfer Extension 1.46.0 ~ 1.47.0 -

II. Public POCs for CVE-2026-100242

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III. Intelligence Information for CVE-2026-100242

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Other References for CVE-2026-100242 (3)

Same Patch Batch · Wikimedia Foundation · 2026-09-29 · 8 CVEs total

CVE-2026-100240 TemplateSandbox does not check read permissions for the page being previewed
CVE-2026-100238 Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored X
CVE-2026-100241 Private change tags exposed to anonymous users via revision-tags-change events
CVE-2026-102796 Unauthenticated SQL injection in UserPageViewTracker via filterusers and ignoreusers param
CVE-2026-100244 CentralAuth exposes locally suppressed block information via globaluserinfo API and Specia
CVE-2026-100245 Stored XSS on Wikibase Special:SetSiteLink via unescaped system message
CVE-2026-100243 Stored XSS in WikiSEO author and image properties on action=info

IV. Related Vulnerabilities

Same product: Mediawiki - DataTransfer Extension
Same vendor: Wikimedia Foundation
Same weakness: CWE-1395

V. Comments for CVE-2026-100242

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