CVE-2026-45226
Heym < 0.0.21 Authorization Bypass in Workflow Execution
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.
INFO
Published Date :
May 12, 2026, 10:16 p.m.
Last Modified :
Oct. 26, 2026, 2:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Heym to version 0.0.21 or later.
- Ensure proper access validation for workflow execution.
- Review workflow configurations for malicious references.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-45226.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-45226 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-45226
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-45226 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-45226 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: heym de heymrun, Description: Heym anterior a 0.0.21 contiene una vulnerabilidad de omisión de autorización en la ejecución de flujos de trabajo que permite a usuarios autenticados ejecutar flujos de trabajo arbitrarios al referenciar UUIDs de flujos de trabajo de la víctima sin una validación de acceso adecuada. Los atacantes pueden crear flujos de trabajo con nodos de ejecución o subWorkflowIds de agente que apunten a UUIDs de flujos de trabajo de la víctima para cargar y ejecutar esos flujos de trabajo bajo rutas de ejecución controladas por el atacante, exponiendo las salidas del flujo de trabajo de la víctima y activando nodos del flujo de trabajo con efectos secundarios no deseados. -
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/heymrun/heym', 'vendor': 'heymrun', 'product': 'heym', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.0.21', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8', 'versionType': 'git'}], 'defaultStatus': 'affected'}] [{'repo': 'https://github.com/heymrun/heym', 'vendor': 'heymrun', 'product': 'heym', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.0.21', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8', 'versionType': 'git'}], 'packageURL': 'pkg:github/heymrun/heym', 'defaultStatus': 'affected'}] -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/heymrun/heym', 'vendor': 'heymrun', 'product': 'heym', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.0.21', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8', 'versionType': 'git'}], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-45226', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-13T15:04:16.201985Z'} -
New CVE Received by [email protected]
May. 12, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Added CWE CWE-863 Added Reference https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8 Added Reference https://github.com/heymrun/heym/pull/93 Added Reference https://github.com/heymrun/heym/releases/tag/v0.0.21 Added Reference https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution