CVE-2026-67544

HIGH 8.8

Heym: Playwright Custom Code Backend RCE via `playwrightCode` Field

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to version 0.0.71, Heym's workflow engine accepts an arbitrary Python code string in the playwrightCode field of a Playwright node. This string is written to a temporary .py file and executed directly by the backend process via subprocess.Popen([sys.executable, script_path]) with no sandboxing, AST validation, or role gate. Any authenticated user — including a freshly registered account — can achieve full remote code execution (RCE) on the backend host, running as the service process user (observed as root in the default Docker deployment). This issue has been patched in version 0.0.71.

CWE	CWE-94
Vendor	heymrun
Product	heym
Published	Nov 11, 2026

Stay Ahead of the Next One

Get instant alerts for heymrun heym

Be the first to know when new high vulnerabilities affecting heymrun heym are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

heymrun / heym

< 0.0.71

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/heymrun/heym/security/advisories/GHSA-mp23-7m6r-jfw4 github.com: https://github.com/heymrun/heym/commit/d2fd46c07754c4ed3e80b521aa54cc276039849b github.com: https://github.com/heymrun/heym/releases/tag/0.0.71