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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
heymrun heym unaffected
Version Status Constraints
0 affected < 0.0.53
0.0.53 unaffected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83 cve-icon cve-icon
https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h cve-icon cve-icon
https://www.vulncheck.com/advisories/heym-before-0.0.53-slack-webhook-signature-verification-bypass cve-icon cve-icon
History

Sun, 27 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
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.
Title Heym before 0.0.53 Slack Webhook Signature Verification Bypass
Weaknesses CWE-287
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-27T16:33:42.372Z

Reserved: 2026-09-27T15:48:49.472Z

Link: CVE-2026-101049

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-27T17:16:55.967

Modified: 2026-09-27T17:16:55.967

Link: CVE-2026-101049

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-27T17:30:17Z

Weaknesses