What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-27 · updated 2026-09-28
• Weakness: CWE-287

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.

Affected products

• heymrun heym: before 0.0.53 — fixed in 0.0.53

How to fix

Upgrade to a fixed version: heymrun heym 0.0.53. Check the vendor advisory for mitigations.

References

• https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83
• https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h
• https://www.vulncheck.com/advisories/heym-before-0.0.53-slack-webhook-signature-verification-bypass
• https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h

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