← Vulnerability feed

Vulnerability record · CVE-2026-63429 · published 20 July 2026

CVE-2026-63429: Missing authentication for critical function vulnerability

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.

8.6 CVSS 3.1 High EPSS 0.51% · top 59.2% CWE-306 · Missing authentication for critical functionCWE-434 · Unrestricted file upload Deferred
8.6CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Jul 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

References

LinkTags
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

Track CVE-2026-63429 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2026-67277MikroTik RouterOS btest missing authentication leaks kernel memory and crashes kernelRouterOS accepts a "related" btest connection before the primary session is authenticated, letting an unauthenticated client start an IPv4 UDP test. …KEVEPSS 1.6%analysed8.8CVE-2026-59822LiteLLM MCP endpoint auth bypass via OAuth2 passthrough fallbackLiteLLM's MCP Streamable HTTP endpoint, prior to 1.84.0, let an unauthenticated attacker send a fabricated Authorization header that triggered an OAu…KEVEPSS 0.84%analysed9.3CVE-2026-72529TrueConf Server missing authentication allows remote script executionTrueConf Server versions 5.3.X through 5.3.9, 5.4.X through 5.4.9, 5.5.X through 5.5.5, and earlier expose an undocumented function on port 4307/TCP …KEVEPSS 1.5%analysed9.8CVE-2026-46817Oracle E-Business Suite Payments missing authentication allows takeoverOracle Payments in Oracle E-Business Suite 12.2.3 through 12.2.15 contains an easily exploitable flaw in the File Transmission component. An unauthen…KEVEPSS 0.81%analysed9.8CVE-2026-56164Microsoft SharePoint Server missing authentication allows privilege elevationMicrosoft Office SharePoint Server contains a missing authentication flaw in a critical function (CWE-306), letting an unauthenticated attacker reach…KEVEPSS 1.0%analysed9.8CVE-2026-20253Splunk Enterprise PostgreSQL sidecar missing authentication allows file writesSplunk Enterprise 10.2 below 10.2.4 and 10.x below 10.0.7 expose a PostgreSQL sidecar service endpoint that lacks authentication controls. Any networ…KEVEPSS 97%analysed9.8CVE-2026-35273Oracle PeopleSoft PeopleTools missing authentication allows takeoverOracle PeopleSoft Enterprise PeopleTools (Updates Environment Management component) in versions 8.61 and 8.62 is missing authentication for a critica…KEVEPSS 9.4%analysed9.3CVE-2026-41940cPanel and WHM login flow authentication bypasscPanel, WHM and WP Squared versions after 11.40 contain a missing-authentication flaw in the login flow (CWE-306) that lets unauthenticated remote at…KEVEPSS 99%analysed

Source: NIST National Vulnerability Database (record CVE-2026-63429), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.