Resource exhaustion in @Apostrophecms Import-Export
CVE-2026-113711
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.
Vulnerability class: DoS (Denial of Service)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- @Apostrophecms Import-Export — versions < 3.7.0
- Apostrophecms Apostrophe — versions < 4.33.0
Weakness classification (CWE)
References
- github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq
- github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed09438…
- github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130…
- github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0
Frequently asked questions
- What is CVE-2026-113711?
- CVE-2026-113711 is a high-severity vulnerability in @Apostrophecms Import-Export, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-10-20.
- How severe is CVE-2026-113711?
- High severity. CVSS v3 base score is 7.5 out of 10.