Security fix · CVE-2026-113656
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 3, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-113656. EPSS is 0.46%. 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
- Medium5.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.46%
- Remediation
- Advisory link
- Affected products
- npm @apostrophecms/form · package npm
**Summary** The form submission endpoint runs before authentication, API-key, CSRF-equivalent, or form-existence logic, with no size/count/rate limits. Unauthenticated users can stream unbounded bodies to disk per request; cleanup occurs only after the full body is received. **Details** (L274–296): . No , no rate limiting, no pre-validation. "CSRF" is a fixed-value double-submit cookie ( , set on any GET, express/index.js L694–703) — trivially obtainable anonymously. **PoC** **Impact** Any unauthenticated client can force the server to persist entire request bodies to the temp filesystem and CPU-decode them; parallel requests exhaust disk (process/host crash) and saturate the event loop — a trivial remote DoS. Aborted transfers risk orphaning staged files (no cleanup). **Remediation** — Set multer (fileSize, fields, parts, fieldSize); perform auth/role/existence checks before the multer mount or inside the checked handler; unlink staged files on first read and on /error; add per-IP rate limiting.
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 @apostrophecms/form0 → 1.5.5
- package npmversion unspecified
How to fix CVE-2026-113656
Upgrade
CVE-2026-113656 lists a fix boundary at 1.5.5. Compare the installed build with that boundary before you change production.
Version check
Fixed in 1.5.5
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-2026-113656. EPSS is 0.46%. 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 → 1.5.5. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.46%. 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 1.5.5 of the ApostropheCMS Form add-on, its form submission route stages unbounded multipart uploads before form validation or authentication and lacks upload size, count, and rate limits. Repeated unauthenticated submissions can consume temporary disk storage and disrupt form handling or other host services. This issue is
Oct 20, 2026 · GitHub Advisory Database
Fix available
@apostrophecms/form fixed in 1.5.5
Oct 20, 2026 · GitHub Advisory Database
Fix available
@apostrophecms/form fixed in 1.5.5
Oct 20, 2026 · GitHub Advisory Database
Updated
**Summary** The form submission endpoint runs before authentication, API-key, CSRF-equivalent, or form-existence logic, with no size/count/rate limits. Unauthenticated users can stream unbounded bodies to disk per request; cleanup occurs only after the full body is received. **Details** (L274–296): . No , no rate limiting, no pre-validation. "CSRF" is a fixed-value double-submit cookie ( , set on
Oct 20, 2026 · NIST NVD
Updated
ApostropheCMS is an open-source Node.js content management system. Prior to 1.5.5 of the ApostropheCMS Form add-on, its form submission route stages unbounded multipart uploads before form validation or authentication and lacks upload size, count, and rate limits. Repeated unauthenticated submissions can consume temporary disk storage and disrupt form handling or other host services. This issue is
Oct 21, 2026 · NIST NVD
Updated
ApostropheCMS is an open-source Node.js content management system. Prior to 1.5.5 of the ApostropheCMS Form add-on, its form submission route stages unbounded multipart uploads before form validation or authentication and lacks upload size, count, and rate limits. Repeated unauthenticated submissions can consume temporary disk storage and disrupt form handling or other host services. This issue is
Sources
- CVE.orgVulnerability recordCVE-2026-113656
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-113656
30-day exploitation probability 0.46%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-89mh-mm8c-mv7f
GitHub Advisory Database record mirrored by OSV.
github.com - NIST NVDVulnerability recordCVE-2026-113656
ApostropheCMS is an open-source Node.js content management system. Prior to 1.5.5 of the ApostropheCMS Form add-on, its form submission route stages unbounded multipart uploads before form validation or authentication and lacks upload size, count, and rate limits. Repeated unauth
nvd.nist.gov - OpenSSF OSV / OSV ScannerPackage advisoryGHSA-89mh-mm8c-mv7f
ApostropheCMS: Unauthenticated unbounded multipart upload → disk-exhaustion DoS
osv.dev - Snyk Vulnerability DatabasePackage advisorySNYK-JS-APOSTROPHECMSFORM-21691380
Allocation of Resources Without Limits or Throttling
security.snyk.io
References
Freshness
Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 3, 2026
- Snyk Vulnerability DatabaseOct 26, 2026
- CVE.orgOct 21, 2026
- NIST NVDOct 21, 2026
- GitHub Advisory DatabaseOct 20, 2026
- OpenSSF OSV / OSV ScannerOct 20, 2026