CVE-2026-100862

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.

• https://github.com/heymrun/heym/security/advisories/GHSA-6x65-w7q7-wg93

• https://github.com/heymrun/heym/security/advisories/GHSA-6x65-w7q7-wg93
• https://www.vulncheck.com/advisories/heym-before-0.0.91-multiple-secrets-plaintext-storage

• UNSCOREDCVE-2026-100288
• MEDIUMCVE-2026-100581PoC
• CRITICALCVE-2026-15721
• HIGHCVE-2026-55997PoC
• UNSCOREDCVE-2026-63207PoC
• MEDIUMCVE-2026-63406PoC
• UNSCOREDCVE-2026-67221PoC
• UNSCOREDCVE-2026-67236PoC

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