CVE-2026-45797 Details
Description
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.
A stored cross-site scripting vulnerability has been identified in HeyForm, an open-source form builder, prior to version 3.0.0-rc.7. The issue arises from the '/api/upload' endpoint, which allows unauthenticated file uploads, including SVG files. These uploaded SVGs are stored in the static assets directory and served with 'Content-Type: image/svg+xml' by Express's serve-static middleware. This misconfiguration enables an attacker to execute embedded JavaScript on the HeyForm domain without any authentication.
Users can update to HeyForm version 3.0.0-rc.7 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 20, 2026CISA-ADP
Assessed Jul 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674 | [email protected] | Source CodeVendor |
| https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| HeyForm | <= 0.0.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | [email protected] |