High severity · published Oct 20, 2026
CVE-2026-113711
ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AP
apostrophe · apostrophecms
< 4.33.0 · source: vendor
IM
import-export · @apostrophecms
< 3.7.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-113711
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-113711
github.com
https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce
github.com
https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350
github.com
https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0
github.com
https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq
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