Vulnerability-Lookup

CVE-2026-84207 (GCVE-0-2026-84207)

Vulnerability from cvelistv5 – Published: 2026-09-01 15:19 – Updated: 2026-09-01 17:34

Title

Heym before 0.0.98 SSRF via WebSocket endpoints

Summary

Heym before 0.0.98 fails to apply SSRF egress guards to WebSocket Send and WebSocket Trigger nodes, allowing authenticated users to connect to internal services. Attackers can craft workflow nodes with arbitrary URLs and headers to reach internal services and read responses from the WebSocket Trigger node.

Severity

5.3 (Medium)


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

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 17:30 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

VulnCheck mitre root

References

7 references

URL	Tags
https://github.com/heymrun/heym	product
https://github.com/heymrun/heym/security/advisori…	vendor-advisory
https://github.com/heymrun/heym/commit/540aade7c7…	patch
https://github.com/heymrun/heym/releases/tag/v0.0.98	release-notes
https://github.com/heymrun/heym/blob/v0.0.97/back…	technical-description
https://github.com/heymrun/heym/blob/v0.0.97/back…	technical-description
https://www.vulncheck.com/advisories/heym-before-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
heymrun	heym	Affected: 0 , < 0.0.98 (semver) Unaffected: 0.0.98 (semver)	guessed

Date Public

2026-08-27 00:00

Credits

euriconicacio

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-84207

Vulnerability from fkie_nvd - Published: 2026-09-01 16:17 - Updated: 2026-09-01 18:17

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/heymrun/heym
	disclosure@vulncheck.com	https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py
	disclosure@vulncheck.com	https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py
	disclosure@vulncheck.com	https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c
	disclosure@vulncheck.com	https://github.com/heymrun/heym/releases/tag/v0.0.98
	disclosure@vulncheck.com	https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-01T17:30:12.250553Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-01T16:17:35.763",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/heymrun/heym"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/heymrun/heym/releases/tag/v0.0.98"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-488W-5JV5-7W7Q

Vulnerability from github – Published: 2026-09-01 18:30 – Updated: 2026-09-01 18:30

Details

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

5.3 (Medium)


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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-84207"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-01T16:17:35Z",
    "severity": "MODERATE"
  },
  "details": "Heym before 0.0.98 fails to apply SSRF egress guards to WebSocket Send and WebSocket Trigger nodes, allowing authenticated users to connect to internal services. Attackers can craft workflow nodes with arbitrary URLs and headers to reach internal services and read responses from the WebSocket Trigger node.",
  "id": "GHSA-488w-5jv5-7w7q",
  "modified": "2026-09-01T18:30:44Z",
  "published": "2026-09-01T18:30:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84207"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/releases/tag/v0.0.98"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-84207 (GCVE-0-2026-84207)

FKIE_CVE-2026-84207

GHSA-488W-5JV5-7W7Q

Tags

Sightings

Nomenclature