CVE-2026-100862 PUBLISHED

heym before 0.0.91 Multiple Secrets Plaintext Storage

Assigner: VulnCheck
Reserved: 27.09.2026 Published: 27.09.2026 Updated: 27.09.2026

heym, a workflow automation platform, stores and returns multiple capability secrets in plaintext in versions prior to 0.0.91. Affected secrets include webhook header-auth values (returned in cleartext by GET /api/workflows/{id} and persisted unsanitized into execution history), MCP API keys (stored as a plaintext column, returned in config/list responses, and accepted via the ?key= query string so they leak into logs, proxies and Referer headers), portal session tokens (stored and validated by plaintext equality with a 168-hour TTL), workflow execution JWTs (stored in full and re-listed by GET .../execution-tokens), Discord interaction tokens (the full interaction body is stored in execution history), and global variables. A user with read access to a workflow, share/team membership, or anyone able to read the database, a backup, or logs can recover these secrets and replay them to execute workflows or act as the secret owner.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 6.9

Product Status

Vendor heymrun
Product heym
Versions Default: unaffected
  • affected from 0 to 0.0.91 (excl.)
  • Version 0.0.91 is unaffected

Credits

  • mbakgun finder

References

Problem Types

  • Cleartext Storage of Sensitive Information CWE