CVE-2026-45797
Published:July 20, 2026
Updated:August 06, 2026
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.
Affected Packages
https://github.com/heyform/heyform.git (GITHUB):
Affected version(s) >=v0.0.1 <v3.0.0-rc.7Fix Suggestion:
Update to version v3.0.0-rc.7Related Resources (4)
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Contact UsCVSS v4
Base Score:
6.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.40