CVE-2026-82291: Heyform

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Heyform Heyform: before 3.0.0-rc.8 (fixed in 3.0.0-rc.8)

Published 2026-08-28. Last modified 2026-09-16.