CVE-2026-45226
Heym < 0.0.21 Authorization Bypass in Workflow Execution
CVSS Score
7.1
EPSS Score
0.1%
EPSS Percentile
16th
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.
| CWE | CWE-863 |
| Vendor | heymrun |
| Product | heym |
| Published | May 12, 2026 |
| Last Updated | May 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low
Affected Versions
heymrun / heym
0 < 0.0.21
References
github.com: https://github.com/heymrun/heym/releases/tag/v0.0.21 github.com: https://github.com/heymrun/heym/pull/93 github.com: https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8 vulncheck.com: https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution
Credits
Chia Min Jun Lennon