CVE-2026-45226

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductHeym

PublishedMay 12, 2026

First seenMay 12, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Update

heymrun heym0.0.21 or later

Patches

github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8

Vendor advisories

github.com/heymrun/heym/releases/tag/v0.0.21

Affected products

Product	Affected versions	Fixed in
heymrun heym	v < 0.0.21	0.0.21

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