CVE-2026-45797
HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 CWE-434 |
| Vendor | heyform |
| Product | heyform |
| Published | Jul 20, 2026 |
| Last Updated | Jul 20, 2026 |
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Affected Versions
heyform / heyform
< 3.0.0-rc.7