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Vulnerability record · CVE-2026-45226 · published 12 May 2026

CVE-2026-45226: Incorrect authorization vulnerability

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.

7.6 CVSS 4.0 High EPSS 0.49% · top 60.7% CWE-863 · Incorrect authorization Deferred
7.6CVSS 4.0 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

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.

CVSS:4.0/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:

References

LinkTags
https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8
https://github.com/heymrun/heym/pull/93
https://github.com/heymrun/heym/releases/tag/v0.0.21
https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution

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Source: NIST National Vulnerability Database (record CVE-2026-45226), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.