CVE-2026-84207
Received Received - Intake

Heym SSRF Bypass via WebSocket Nodes

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: VulnCheck

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.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-84207
EUVD
EUVD-2026-69295

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
heym heym to 0.0.98 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

This is a Server-Side Request Forgery (SSRF) vulnerability in Heym before version 0.0.98. It allows authenticated users to bypass SSRF protections by using WebSocket Send or WebSocket Trigger nodes to connect to internal services. Attackers can craft nodes with arbitrary URLs and headers to access internal services and read responses from the WebSocket Trigger node.

Detection Guidance

To detect this vulnerability, check if your Heym instance is running a version before 0.0.98. Use commands like 'heym version' or inspect the running container/service logs for version details. Monitor network traffic for unexpected WebSocket connections to internal or restricted addresses.

Impact Analysis

An attacker with authenticated access could exploit this to connect to internal network services, manipulate request headers, and read partial data from internal services via the WebSocket Trigger node. This could lead to unauthorized access to sensitive internal resources or data exfiltration.

Compliance Impact

This vulnerability could lead to unauthorized access to internal services and data exfiltration, which may violate compliance requirements under GDPR (data protection) and HIPAA (health information privacy). Organizations using Heym must ensure proper SSRF protections are in place to maintain regulatory compliance.

Mitigation Strategies

Upgrade Heym to version 0.0.98 or later immediately. Ensure the new SSRF guard for WebSocket connections is enabled. Review and restrict access to internal services. Disable unnecessary WebSocket connections to sensitive addresses.

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