HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials

Advisories

HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials

severity: high
date: 8/28/2026
Affecting: heyform >= 0, < 3.0.0-rc.8
CVE: CVE-2026-82291
CWE: CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains
CVSS: 8.1
References: GHSA-fg7j-rmgr-rc9g
Vulnerable code: main.ts
Fix commit
https://github.com/heyform/heyform
Credit: George Chen
Description: 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 to access workspaces, projects, forms, submissions, and respondent data, or modify account settings.

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