CVE-2026-63429

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.

• CWE-306
• CWE-434

• https://github.com/heyform/heyform/commit/092e255e9e02565de1b3c057f3dad849160952d2
• https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7
• https://github.com/heyform/heyform/security/advisories/GHSA-432x-54v2-p7p7

Published

Jul 20, 2026

Last Modified

Jul 22, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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