TI-2026-64996 Aliases CVE-2026-100858 GHSA-68x6-m7x2-mcgw

heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes

HIGH 68CWE-918Published 2026-09-27 · Updated 2026-09-30

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

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) 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).

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00339 27th percentileScored 2026-11-07

Fix Fixed heym (heymrun): 0.0.109

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
heymrun	heym	before 0.0.109	0.0.109	Patch available	CNA

heym Vendorheymrun Affected before 0.0.109 Fixed in 0.0.109 Patch available CNA

Remediation

Fix · CNA heym (heymrun) Fixed in 0.0.109

Timeline

2026-10-02 Threatist record created from CVE-2026-100858
2026-10-03 Alias added: GHSA-68x6-m7x2-mcgw

References

Advisory 1

GitHub Security Advisory (GHSA-39j3-6x3x-8rcr)

TI-2026-71768 Sandbox escape in heym Python tool allows command execution CVSS 3.1HIGH 8.8
TI-2026-65003 Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape CVSS 4.0HIGH 8.7
TI-2026-65002 heym before 0.0.91 Remote Code Execution via Expression Engine CVSS 4.0HIGH 8.7
TI-2026-33042 Heym < 0.0.21 Sandbox Escape via Python Introspection CVSS 4.0HIGH 8.7
TI-2026-65083 Heym before 0.0.53 Authentication Bypass via Telegram Webhook CVSS 4.0HIGH 8.3
TI-2026-65082 Heym before 0.0.53 Slack Webhook Signature Verification Bypass CVSS 4.0HIGH 8.3

See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences