CVE-2026-45226 json
Heym < 0.0.21 Authorization Bypass in Workflow Execution
published 2026-05-12 5 mo ago modified 2026-11-08 24 h ago also EUVD-2026-29868
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
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 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.
Patch / fix
- heymrun heym 0.0.21
- github.com/heymrun/heym@3ae3ef6 commit
- github.com/heymrun/heym#93 pull request
- github.com/heymrun/heym/releases/tag/v0.0.21 release
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.6 | 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 |
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L |
| CNA | 4.0 | 7.6 | 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:X/V:X/RE:X/U:X |
Affected products
- heymrun heym
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/heymrun/heym/pull/93
issue-tracking, patch
-
github.com
/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8
patch
-
github.com
/heymrun/heym/releases/tag/v0.0.21
release-notes
-
vulncheck.com
/advisories/heym-authorization-bypass-in-workflow-execution
third-party-advisory
Sources
- CVE List CVE-2026-45226
- NVD CVE-2026-45226
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