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.
References5
- github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07f…
- github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d00…
- github.com/apostrophecms/apostrophe/releases/tag/[email protected]…
- github.com/apostrophecms/apostrophe/security/advisories/GHSA-86…
- github.com/apostrophecms/apostrophe/security/advisories/GHSA-86…
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 47 · as of 9 November 2026
- CWE
- CWE-400CWE-770
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.