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Medium

heym before 0.0.91 Multiple Secrets Plaintext Storage

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100862
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 01:12 UTC · Revision 1

Source evidence

heym before 0.0.91 Multiple Secrets Plaintext Storage

core-osv · Original source

Published 27 Sept 2026, 01:28 UTC

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.

osv:CVE-2026-100862
Complete source record
{
  "id": "d1ad9487160cdd8a453bcde4afc65e702dcb1f93e841fad9b842becf20b12b01",
  "url": "https://osv.dev/vulnerability/CVE-2026-100862",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "heym before 0.0.91 Multiple Secrets Plaintext Storage",
    "summary": "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.",
    "evidence": "osv:CVE-2026-100862",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100862",
      "aliases": [
        "CVE-2026-100862",
        "GHSA-6x65-w7q7-wg93"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/heymrun/heym",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1267b7b6a02f88eb447a5d09057296c4fac54c67"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.0.91"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.0.91"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.0.90",
            "v0.0.89",
            "v0.0.88",
            "v0.0.87",
            "v0.0.86",
            "v0.0.85",
            "v0.0.84",
            "v0.0.83",
            "v0.0.82",
            "v0.0.81",
            "v0.0.79",
            "v0.0.80",
            "v0.0.78",
            "v0.0.77",
            "v0.0.76",
            "v0.0.75",
            "v0.0.74",
            "0.0.73",
            "v0.0.72",
            "opencode-pr-assets",
            "0.0.71",
            "codex-pr-assets",
            "0.0.70",
            "v0.0.69",
            "v0.0.68",
            "v0.0.67",
            "v0.0.66",
            "v0.0.65",
            "v0.0.64",
            "v0.0.63",
            "v0.0.62",
            "v0.0.61",
            "v0.0.60",
            "v0.0.59",
            "v0.0.58",
            "v0.0.57",
            "v0.0.56",
            "v0.0.55",
            "v0.0.54",
            "v0.0.53",
            "v0.0.52",
            "v0.0.51",
            "v0.0.50",
            "v.0.0.49",
            "v0.0.48",
            "v0.0.47",
            "v0.0.46",
            "v0.0.45",
            "v0.0.44",
            "v0.0.43",
            "v0.0.42",
            "v0.0.41",
            "v0.0.40",
            "v0.0.39",
            "v0.0.38",
            "v0.0.37",
            "v0.0.36",
            "v0.0.35",
            "v0.0.34",
            "v0.0.33",
            "v0.0.32",
            "v0.0.31",
            "v0.0.30",
            "v0.0.29",
            "v0.0.27",
            "v0.0.26",
            "v0.0.25",
            "v0.0.24",
            "v0.0.23",
            "v0.0.22",
            "v0.0.21",
            "v0.0.20",
            "v0.0.19",
            "v0.0.18",
            "v0.0.17",
            "v0.0.16",
            "v0.0.15",
            "v0.0.14",
            "v0.0.13",
            "v0.0.12",
            "v0.0.11",
            "v0.0.10",
            "v0.0.9",
            "v0.0.8",
            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100862.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.533436936Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100862.json",
        "https://github.com/heymrun/heym/security/advisories/GHSA-6x65-w7q7-wg93",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100862",
        "https://www.vulncheck.com/advisories/heym-before-0.0.91-multiple-secrets-plaintext-storage"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-312"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100862.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100862",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521234,
  "published_at": "2026-09-27T01:28:51.915+00:00"
}