Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M

CVE-2026-113711ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export

High 7.5

In plain English

A high-severity uncontrolled resource consumption in apostrophe from apostrophecms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.6%top 53.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@apostrophecms/import-export	3.7.0	GHSA-86wm-68pq-5jwq
npm	apostrophe	4.33.0	GHSA-86wm-68pq-5jwq

Affected products (as reported)

Vendor	Product	Versions
apostrophecms	apostrophe	< 4.33.0
@apostrophecms	import-export	< 3.7.0

Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq x_refsource_CONFIRM
https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce x_refsource_MISC
https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350 x_refsource_MISC
https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0 x_refsource_MISC