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CVE-2026-100859— Heym before 0.0.106 Credential Exfiltration via URL Override

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 在版本 0.0.106 之前存在凭证外泄漏洞，该漏洞位于 POST /api/credentials/test 接口，允许具有共享凭证访问权限的协作者窃取凭证持有者的密钥信息。攻击者可通过覆盖 config 参数中的目标 URL，使服务器将解密的认证密钥发送至攻击者控制的端点。

CVSS 6.5 · Medium EPSS 0.25% · P15
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I. Basic Information for CVE-2026-100859

Vulnerability Information
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Vulnerability Title
Heym before 0.0.106 Credential Exfiltration via URL Override
Source: CVE Program / CVE List V5
Vulnerability Description
Heym before 0.0.106 contains a credential exfiltration vulnerability in the POST /api/credentials/test endpoint that allows collaborators with shared credential access to exfiltrate the credential owner's secret. Attackers can override the destination URL in the config parameter to cause the server to send decrypted authentication secrets to attacker-controlled endpoints.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 ~ 0.0.106 -

II. Public POCs for CVE-2026-100859

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III. Intelligence Information for CVE-2026-100859

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Vendor Advisories for CVE-2026-100859 (1)

Other References for CVE-2026-100859 (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-2026-100858 6.8 MEDIUM heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes
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-2026-100860 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-2026-100859

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