CVE-2026-100858

Medium

Description

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).

SeverityMedium

CVSS6.8

Exploit probability—

ProductHeym

PublishedSep 27, 2026

First seenSep 27, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

heymrun heym0.0.109 or later

Vendor advisories

github.com/heymrun/heym/security/advisories/GHSA-39j3-6x3x-8rcr

Affected products

Product	Affected versions	Fixed in
heymrun heym	v < 0.0.109	0.0.109

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