Plaintext Secret Storage Vulnerability in heym Workflow Automation Platform
CVE-2026-100862

6.9MEDIUM

Key Information:

Vendor

Heymrun

Status
Heym
Vendor
CVE Published:
27 September 2026

What is CVE-2026-100862?

The heym Workflow Automation Platform is vulnerable to a serious issue where multiple sensitive credentials, such as webhook header-auth values, MCP API keys, and session tokens, are stored and returned in plaintext. This vulnerability exists in all versions prior to 0.0.91, exposing highly confidential information in execution histories and logs. Users with access to workflow data, including team members or anyone able to read backups, can exploit these plaintext secrets to hijack workflows or impersonate authorized users. Immediate updates are advised to mitigate this risk and protect sensitive information.

Affected Version(s)

heym 0 < 0.0.91

heym 0.0.91

References

https://github.com/heymrun/heym/security/advisories/GHSA-...
vendor-advisory
https://www.vulncheck.com/advisories/heym-before-0.0.91-m...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

mbakgun
.