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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
heymrun heym unaffected
Version Status Constraints
0 affected < 0.0.98
0.0.98 unaffected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/heymrun/heym cve-icon cve-icon
https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py cve-icon cve-icon
https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py cve-icon cve-icon
https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c cve-icon cve-icon
https://github.com/heymrun/heym/releases/tag/v0.0.98 cve-icon cve-icon
https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596 cve-icon cve-icon
https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints cve-icon cve-icon
History

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Heym before 0.0.98 SSRF via WebSocket endpoints
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': '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'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-01T17:34:22.997Z

Reserved: 2026-09-01T11:03:27.973Z

Link: CVE-2026-84207

cve-icon Vulnrichment

Updated: 2026-09-01T17:30:18.734Z

cve-icon NVD

Status : Received

Published: 2026-09-01T16:17:35.763

Modified: 2026-09-01T18:17:48.960

Link: CVE-2026-84207

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses