---
id: CVE-2026-45226
title: Heym < 0.0.21 Authorization Bypass in Workflow Execution
summary: >-
  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 c…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-863
vendor: heymrun
product: heym
affected:
  - heym < 0.0.21
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-05-13T15:04:16.201985Z'
published: '2026-05-12'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:03:41.069Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-45226'
references:
  - url: 'https://github.com/heymrun/heym/releases/tag/v0.0.21'
    label: heym 0.0.21 Release Notes
  - url: 'https://github.com/heymrun/heym/pull/93'
  - url: >-
      https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8
  - url: >-
      https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution
tags:
  - cve.org
epss: 0.00293
epssPercentile: 0.2205
ingestedAt: '2026-11-08T14:51:22.423Z'
---

## Overview

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

- `heym < 0.0.21`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.