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CVE-2026-101049— Heym before 0.0.53 Slack Webhook Signature Verification Bypass

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 0.0.53 版本之前，当触发节点缺少凭证 ID 或签名密钥为空时，未能正确验证 Slack 请求的签名。远程未认证的攻击者可以向已知的 Webhook URL 发送伪造的 Slack 事件，从而以拥有者的凭证触发工作流。

CVSS 6.5 · Medium Updated Sep 28, 2026

Possible ATT&CK Techniques 2 AI

T1530 · Data from Cloud Storage T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Heym before 0.0.53 Slack Webhook Signature Verification Bypass

Source: CVE Program / CVE List V5

Vulnerability Description

Heym before 0.0.53 fails to verify Slack request signatures when trigger nodes lack credential IDs or have empty signing secrets. Remote unauthenticated attackers can send forged Slack events to known webhook URLs to trigger workflows with the owner's credentials.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

认证机制不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
heymrun	heym	0 ~ 0.0.53	-

II. Public POCs for CVE-2026-101049

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-101049

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Vendor Advisories for CVE-2026-101049 (1)

🔗 Heym before 0.0.53 Slack Webhook Signature Verification Bypass | Advisories | VulnCheck third-party-advisory

Other References for CVE-2026-101049 (2)

https://www.cve.org/CVERecord?id=CVE-2026-101049

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-2026-100859	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-287

V. Comments for CVE-2026-101049

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-101049— Heym before 0.0.53 Slack Webhook Signature Verification Bypass

Quick assessment

Possible ATT&CK Techniques 2 AI

I. Basic Information for CVE-2026-101049

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-101049

III. Intelligence Information for CVE-2026-101049

Vendor Advisories for CVE-2026-101049 (1)

Other References for CVE-2026-101049 (2)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-101049

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