Vulnerability Description
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `openToken` requirement, and no session cookie check. Any anonymous internet user can upload files (PDF, DOC/DOCX, XLS/XLSX, CSV, TXT, MP4, images, etc., up to 10 MB) and receive a permanent public URL on the HeyForm domain. The endpoint is used by both authenticated form creators and unauthenticated form submitters; because no form-context binding exists, every request to it is anonymously accepted. Version 3.0.0-rc.9 contains a patch for the issue.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952
- https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7
- https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7
FAQ
What is CVE-2026-63429?
CVE-2026-63429 is a vulnerability with a CVSS score of 8.6 (HIGH). HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `openToken` requirement, and no ses...
How severe is CVE-2026-63429?
CVE-2026-63429 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63429?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.