What’s Vulnerable › Vulnerabilities

CVE-2026-45226: Heym < 0.0.21 Authorization Bypass in Workflow Execution

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-863

Description

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

How to fix

Upgrade to a fixed version: heymrun heym 0.0.21. Check the vendor advisory for mitigations.

References

• https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8
• https://github.com/heymrun/heym/pull/93
• https://github.com/heymrun/heym/releases/tag/v0.0.21
• https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution

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