Heyform vulnerabilities
We track 4 vulnerabilities in Heyform products. 4 are rated high or critical, and none are known to be exploited. The most recent was published on November 5, 2026.
Latest Heyform vulnerabilities
- 7.6 High severity
heyform: Improper Neutralization of Input During Web Page Generation
HeyForm is an open-source form builder. Prior to 3.0.1, /api/upload accepts a file according to the client-controlled multipart file.mimetype while retaining an HTML filename, and static/upload serves the resulting file as text/html with contentSecurityPolicy:
- 8.1 High severity
heyform: Permissive Cross-domain Security Policy with Untrusted Domains
HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses while allowing credentials, enabling cross-origin requests with authentication. Attackers can execute authenticated GraphQL queries from malicious pages visited by logged-in users t
- 8.6 High severity
heyform: Missing Authentication for Critical Functionality
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 fi
- 9.0 Critical severity
heyform: Improper Neutralization of Input During Web Page Generation
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, a stored cross-site scripting (XSS) vulnerability in the form builder allows a low-privileged team member to inject malicious JavaScript that executes when a team owner views the form, leadin