CVE-2026-100858

MEDIUM 6.8

heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes

CVSS Score

6.8

EPSS Score

0.0%

EPSS Percentile

0th

heym before 0.0.109 contains a server-side request forgery vulnerability in the Slack, Discord, and Crawler workflow nodes. These nodes issue HTTP requests to URLs taken from user-created credentials (webhook_url / flaresolverr_url) using an unguarded HTTP client, bypassing the SSRF egress guard that already protects the HTTP, WebSocket, and MCP nodes; the credential API validates only that the URL is non-empty. Any registered user can create a credential pointing at an internal address and execute a workflow, causing the backend to reach loopback, private, link-local, or cloud-metadata endpoints and return the full response body in the node output (non-blind SSRF).

CWE	CWE-918
Vendor	heymrun
Product	heym
Published	Sep 27, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

heymrun / heym

0 < 0.0.109

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/heymrun/heym/security/advisories/GHSA-39j3-6x3x-8rcr vulncheck.com: https://www.vulncheck.com/advisories/heym-before-0.0.109-server-side-request-forgery-via-workflow-nodes

Credits

🔍 unbengable12 mbakgun