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8 vulnerabilities by heyform
CVE-2026-63429 (GCVE-0-2026-63429)
Vulnerability from nvd – Published: 2026-07-20 15:54 – Updated: 2026-07-20 17:45
VLAI
EPSS
VEX
Title
HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth/session/form context
Summary
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.
Severity
8.6 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/092e255… | x_refsource_MISC |
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CVE-2026-63428 (GCVE-0-2026-63428)
Vulnerability from nvd – Published: 2026-07-20 15:50 – Updated: 2026-07-20 16:13
VLAI
EPSS
VEX
Title
HeyForm: completeSubmission persists submitter-supplied hidden fields verbatim without validating against the form's declared hidden-field set
Summary
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `completeSubmission` accepts a `hiddenFields: [{id, name, value}]` array from the submitter and stores it verbatim in `submission.hiddenFields`, without validating the supplied `id`/`name` against the form's declared `form.hiddenFields` schema. An anonymous form submitter can therefore inject arbitrary key/value pairs (including XSS payloads, fake authorization metadata, integration-relevant values) into the stored submission. These fields are subsequently forwarded as-is to every webhook integration registered on the form. Version 3.0.0-rc.9 contains a patch for the issue.
Severity
5.8 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/092e255… | x_refsource_MISC |
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CVE-2026-45797 (GCVE-0-2026-45797)
Vulnerability from nvd – Published: 2026-07-20 15:43 – Updated: 2026-07-20 19:07
VLAI
EPSS
VEX
Title
HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload
Summary
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/144240e… | x_refsource_MISC |
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CVE-2026-35198 (GCVE-0-2026-35198)
Vulnerability from nvd – Published: 2026-07-20 15:47 – Updated: 2026-07-20 19:02
VLAI
EPSS
VEX
Title
HeyForm vulnerable to stored XSS via form field titles
Summary
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, leading to complete account takeover through privilege escalation. Version 3.0.0-rc.7 contains a patch for the issue.
Severity
9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/cc97d27… | x_refsource_MISC |
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CVE-2026-63429 (GCVE-0-2026-63429)
Vulnerability from cvelistv5 – Published: 2026-07-20 15:54 – Updated: 2026-07-20 17:45
VLAI
EPSS
VEX
Title
HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth/session/form context
Summary
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.
Severity
8.6 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/092e255… | x_refsource_MISC |
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CVE-2026-63428 (GCVE-0-2026-63428)
Vulnerability from cvelistv5 – Published: 2026-07-20 15:50 – Updated: 2026-07-20 16:13
VLAI
EPSS
VEX
Title
HeyForm: completeSubmission persists submitter-supplied hidden fields verbatim without validating against the form's declared hidden-field set
Summary
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `completeSubmission` accepts a `hiddenFields: [{id, name, value}]` array from the submitter and stores it verbatim in `submission.hiddenFields`, without validating the supplied `id`/`name` against the form's declared `form.hiddenFields` schema. An anonymous form submitter can therefore inject arbitrary key/value pairs (including XSS payloads, fake authorization metadata, integration-relevant values) into the stored submission. These fields are subsequently forwarded as-is to every webhook integration registered on the form. Version 3.0.0-rc.9 contains a patch for the issue.
Severity
5.8 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/092e255… | x_refsource_MISC |
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CVE-2026-35198 (GCVE-0-2026-35198)
Vulnerability from cvelistv5 – Published: 2026-07-20 15:47 – Updated: 2026-07-20 19:02
VLAI
EPSS
VEX
Title
HeyForm vulnerable to stored XSS via form field titles
Summary
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, leading to complete account takeover through privilege escalation. Version 3.0.0-rc.7 contains a patch for the issue.
Severity
9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/cc97d27… | x_refsource_MISC |
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CVE-2026-45797 (GCVE-0-2026-45797)
Vulnerability from cvelistv5 – Published: 2026-07-20 15:43 – Updated: 2026-07-20 19:07
VLAI
EPSS
VEX
Title
HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload
Summary
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/heyform/heyform/security/advis… | x_refsource_CONFIRM |
| https://github.com/heyform/heyform/commit/144240e… | x_refsource_MISC |
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