CVE-2026-101049 heymrun CVE debrief

Who should care

Defenders responsible for Heym installations, workflow automation, and Slack integration security should assess exposure and prioritize remediation. This includes verifying Heym installations, monitoring workflow logs, and implementing additional security controls. Security teams and operators managing Heym and Slack integrations must review and update their configurations to prevent exploitation.

Why it matters

CVE-2026-101049 is a high-severity vulnerability in Heym workflow automation tool that allows remote unauthenticated attackers to trigger workflows with owner's credentials. Defenders should prioritize verifying and updating Heym installations, monitoring workflow logs, and implementing additional security controls.

• Verify and update Heym installations to prevent exploitation
• Monitor workflow logs for suspicious activity
• Implement additional security controls for Slack event validation
• Assess exposure of Heym installations with vulnerable configurations

Technical summary

The Heym workflow automation tool fails to verify Slack request signatures when trigger nodes lack credential IDs or have empty signing secrets. This allows remote unauthenticated attackers to send forged Slack events to trigger workflows with the owner's credentials. Affected Heym installations should be verified and updated to prevent exploitation. The vulnerability has a high severity score and requires immediate attention from defenders responsible for Heym security and Slack integration. Official CVE and NVD records provide further details.

Defensive priority

Defenders should prioritize verifying and updating Heym installations to prevent exploitation.

Recommended defensive actions

• Verify Heym installations for vulnerable configurations
• Update Heym to version 0.0.53 or later
• Monitor workflow logs for suspicious activity
• Implement additional security controls for Slack event validation
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets

Evidence notes

The vulnerability is confirmed by the CVE Program and NVD records. However, details about affected versions, exploitation, and remediation are limited. Defenders should verify Heym installations, review workflow logs, and implement additional security controls. The CVE Program and NVD provide official records, but further source references are needed for comprehensive understanding.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.