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CVE-2026-100858— heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes

Quick assessment

Affected
heymrun heym
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

heym 0.0.109 之前版本中的 Slack、Discord 和 Crawler 工作流节点存在服务端请求伪造（SSRF）漏洞。这些节点使用未加防护的 HTTP 客户端，向用户凭据（webhook_url / flaresolverr_url）中指定的 URL 发起 HTTP 请求，从而绕过了已用于保护 HTTP、WebSocket 和 MCP 节点的 SSRF 出口防护机制；而凭据 API 仅校验 URL 非空，未对其内容进行任何限制。任何已注册用户均可创建指向内部地址的凭据并执行工作流，导致后端访问回环地

CVSS 6.8 · Medium EPSS 0.27% · P17
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I. Basic Information for CVE-2026-100858

Vulnerability Information
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Vulnerability Title
heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
heymrun heym 0 ~ 0.0.109 -

II. Public POCs for CVE-2026-100858

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III. Intelligence Information for CVE-2026-100858

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Vendor Advisories for CVE-2026-100858 (1)

Other References for CVE-2026-100858 (1)

Same Patch Batch · heymrun · 2026-09-27 · 10 CVEs total

CVE-2026-100864 8.8 HIGH heym before 0.0.91 Remote Code Execution via Expression Engine
CVE-2026-100865 8.8 HIGH Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape
CVE-2026-101050 6.5 MEDIUM Heym before 0.0.53 Authentication Bypass via Telegram Webhook
CVE-2026-101049 6.5 MEDIUM Heym before 0.0.53 Slack Webhook Signature Verification Bypass
CVE-2026-100859 6.5 MEDIUM Heym before 0.0.106 Credential Exfiltration via URL Override
CVE-2026-100860 5.5 MEDIUM heym before 0.0.105 Authentication Bypass via Redis Node
CVE-2026-100861 5.0 MEDIUM heym before 0.0.105 SSRF via credential-controlled base URLs
CVE-2026-100863 5.0 MEDIUM Heym before 0.0.91 SSRF via image fetching and IPv6 validation
CVE-2026-100862 4.9 MEDIUM heym before 0.0.91 Multiple Secrets Plaintext Storage

IV. Related Vulnerabilities

Same product: heym
Same vendor: heymrun
Same weakness: CWE-918

V. Comments for CVE-2026-100858

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