CVE-2026-45226 Heym < 0.0.21 Authorization Bypass in Workflow Execution
Authenticated attackers can execute arbitrary victim workflows by referencing their UUIDs, exposing outputs and triggering unintended side effects.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45226?
CVE-2026-45226 is a high-severity missing authorization vulnerability in heymrun heym, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-45226?
How do I fix CVE-2026-45226?
No fix has been published for CVE-2026-45226 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-45226 being exploited?
There is no known exploitation of CVE-2026-45226 in the wild and no public exploit code.
Sources
Also known as GHSA-p953-2g5p-33c5.