---
id: CVE-2026-100858
title: >-
  heym before 0.0.109 contains a server-side request forgery vulnerability in
  the Slack, Discord, and Crawler workflow nodes
summary: >-
  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) usin…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-918
vendor: heymrun
product: heym
affected:
  - heym < 0.0.109
published: '2026-09-27'
updated: '2026-09-27'
sourceUpdated: '2026-09-27T02:17:25.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100858'
references:
  - url: 'https://github.com/heymrun/heym/security/advisories/GHSA-39j3-6x3x-8rcr'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/heym-before-0.0.109-server-side-request-forgery-via-workflow-nodes
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-27T02:41:45.580Z'
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.