Security fix · CVE-2026-113711
ApostropheCMS is an open-source Node.js content management system.
Published Oct 20, 2026 · catalog updated Oct 21, 2026 · ApostropheCMS is an open-source
Last checked Nov 6, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-113711. EPSS is 0.56%. Act only if a listed version of ApostropheCMS is an open-source is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (ApostropheCMS is an open-source).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.56%
- Remediation
- Version ranges on file
- Affected products
- npm @apostrophecms · npm @apostrophecms/import-export · npm apostrophe
## Summary A potential unauthenticated denial-of-service vulnerability exists in the chunked import upload path used by . The affected import API routes invoke: before the actual import handler performs its authentication check. Because no callback is supplied to , unauthenticated requests can reach the , , and operations before the later check rejects the import. As a result, an unauthenticated remote attacker can create server-side upload state, write chunk data to upload storage, trigger temporary-file processing, and cause attacker-controlled cleanup operations before authentication is enforced. ## Affected Component Package: Confirmed affected version: Potential earlier affected versions: The issue may affect earlier 3.x releases in which the current big-upload-based import implementation is present. I have not yet fully verified the exact introduction version and recommend that the maintainers confirm the affected version range. ## Vulnerability Type Primary: **CWE-400 — Uncontrolled Resource Consumption** Related: **CWE-306 — Missing Authentication for Critical Function** **CWE-770 — Allocation of Resources Without Limits or Throttling** ## Technical Details The page import route registers the following middleware chain: No callback is passed to . The implementation explicitly supports an callback and performs that authorization before processing the protocol when supplied. Without that callback, requests containing: or are processed immediately. The actual authentication check occurs later in: This means authentication occurs only after the chunked-upload middleware has already performed server-side work. ## Attack Flow ### 1. Start An unauthenticated attacker submits an request. The server generates an upload ID and stores attacker-supplied upload metadata, including the declared count. ### 2. Chunk The attacker can upload chunk data. copies attacker-controlled data into: ### 3. End The attacker sends an request. begins processing the upload and creates tem
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- npm @apostrophecmsversion unspecified
- npm @apostrophecms/import-export0 → 3.7.0
- npm @apostrophecms/import-export< 3.7.0
- npm apostrophe0 → 4.33.0
- npm apostrophe< 4.33.0
How to fix CVE-2026-113711
Upgrade
CVE-2026-113711 lists a fix boundary at 3.7.0. Compare the installed build with that boundary before you change production.
Version check
Affected < 3.7.0
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-113711. EPSS is 0.56%. Act only if a listed version of ApostropheCMS is an open-source is installed.
Which versions are affected?
Compare what you have installed with 0 → 3.7.0, < 3.7.0, 0 → 4.33.0, < 4.33.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-400: Uncontrolled Resource Consumption; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.56%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 20, 2026 · NIST NVD
Detected
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 imp
Oct 21, 2026 · GitHub Advisory Database
Fix available
apostrophe fixed in 4.33.0; @apostrophecms/import-export fixed in 3.7.0
Oct 21, 2026 · GitHub Advisory Database
Fix available
apostrophe fixed in 4.33.0
Oct 21, 2026 · GitHub Advisory Database
Fix available
@apostrophecms/import-export fixed in 3.7.0
Oct 21, 2026 · GitHub Advisory Database
Updated
## Summary A potential unauthenticated denial-of-service vulnerability exists in the chunked import upload path used by . The affected import API routes invoke: before the actual import handler performs its authentication check. Because no callback is supplied to , unauthenticated requests can reach the , , and operations before the later check rejects the import. As a result, an unauthenticated r
Sources
- CVE.orgVulnerability recordCVE-2026-113711
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-113711
30-day exploitation probability 0.56%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-86wm-68pq-5jwq
ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-113711
A potential unauthenticated denial-of-service vulnerability exists in the chunked import upload path used by @apostrophecms/import-export. The affected import API routes invoke: self.apos.http.bigUploadMiddleware() before the actual import handler performs its authentication check. Because no authorize callback is supplied to bigUploadMiddleware(), unauthenticated requests can reach the aposBigUpl
advisories.gitlab.com - NIST NVDVulnerability recordCVE-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 initializat
nvd.nist.gov - OpenSSF OSV / OSV ScannerPackage advisoryGHSA-86wm-68pq-5jwq
ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export
osv.dev
References
Freshness
Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 6, 2026
- GitLab Advisory DatabaseOct 23, 2026
- GitHub Advisory DatabaseOct 21, 2026
- CVE.orgOct 21, 2026
- OpenSSF OSV / OSV ScannerOct 21, 2026
- NIST NVDOct 20, 2026