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[ CVE-2026-113711 · Published 20 Oct 2026 ]

ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export

CVSS 7.5 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

ApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0 of ApostropheCMS and 3.7.0 of the import-export module, import routes invoke bigUploadMiddleware without an early authorize callback, allowing unauthenticated requests to perform upload initialization, chunk storage, temporary processing, and attacker-declared cleanup work before the later user check rejects the import. This issue is fixed in ApostropheCMS 4.33.0 and import-export 3.7.0.

[ Fixes ]Fixes and patches

  • apostrophe 4.33.0Fixed version · GitHub Advisories · npm package apostrophe: upgrade to 4.33.0 or later (affected < 4.33.0)
  • @apostrophecms/import-export 3.7.0Fixed version · GitHub Advisories · npm package @apostrophecms/import-export: upgrade to 3.7.0 or later (affected < 3.7.0)

[ Packages ]Affected open-source packages

[ References ]References