CVE-2026-45226: Heymrun Heym

High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Heym before 0.0.21 contains an authorization bypass vulnerability in workflow execution that allows authenticated users to execute arbitrary workflows by referencing victim workflow UUIDs without proper access validation. Attackers can create workflows with execute nodes or agent subWorkflowIds pointing to victim workflow UUIDs to load and execute those workflows under attacker-controlled execution paths, exposing victim workflow outputs and triggering workflow nodes with unintended side effects.

Affected products

• Heymrun Heym: before 0.0.21 (fixed in 0.0.21)

Published 2026-05-12. Last modified 2026-07-14.