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CVE-2026-45226 heymrun CVE debrief

CVE-2026-45226 is an authorization bypass vulnerability in Heym workflow execution. The vulnerability 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. This vulnerability has significant implications for system security and integrity.

Vendor
heymrun
Product
heym
CVSS
HIGH 7.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-07-14
Advisory published
2026-05-12
Advisory updated
2026-07-14

Who should care

Users of Heym versions before 0.0.21 should be aware of this vulnerability and take steps to mitigate it. This includes upgrading to version 0.0.21 or later, and monitoring workflow execution for suspicious activity. System administrators, security teams, and operators responsible for workflow management and security should prioritize this vulnerability and take immediate action to protect affected systems.

Technical summary

The vulnerability is caused by a lack of proper access validation when referencing victim workflow UUIDs in Heym workflow execution. This allows authenticated users to execute arbitrary workflows, potentially leading to unauthorized access and malicious activity. The vulnerability has a CVSS score of 7.6 and is considered HIGH severity. Affected systems may be exposed to unintended workflow execution and data access.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Heym version 0.0.21 or later
  • Monitor workflow execution for suspicious activity
  • Implement additional access controls and validation for workflow execution
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability was reported by Vulncheck and is described in their advisory. The CVE record was published on 2026-05-12T22:16:38.127Z and last modified on 2026-07-14T21:16:55.310Z. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected systems and review workflow execution for suspicious activity.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-05-12T22:16:38.127Z and has not been modified since then.