---
title: "CVE-2026-100865: Heym - Multiple Vulnerabilities"
description: "Heym < 0.0.53 contains multiple vulnerabilities including arbitrary code execution via unsandboxed Python eval in workflow conditions, open webhook trigger without authentication, OAuth redirect_uri validation bypass, and plaintext storage of sensitive tokens, letting attackers execute code, trigger workflows, steal tokens, and perform unauthorized actions, exploit requires ability to edit workflows or access public webhook URLs."
url: https://panop.io/threat-heartbeat/CVE-2026-100865/
---

# CVE-2026-100865 Heym - Multiple Vulnerabilities

Heym < 0.0.53 contains multiple vulnerabilities including arbitrary code execution via unsandboxed Python eval in workflow conditions, open webhook trigger without authentication, OAuth redirect\_uri validation bypass, and plaintext storage of sensitive tokens, letting attackers execute code, trigger workflows, steal tokens, and perform unauthorized actions, exploit requires ability to edit workflows or access public webhook URLs.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100865)

## Details

Type

Multiple Vulnerabilities

Impact

Remote Code Execution, Broken Authentication, Information Disclosure, Client Script Exec

CVSS vector

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

Published

27 September 2026

Updated

15 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Update to version 0.0.53 or later

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-100865](https://nvd.nist.gov/vuln/detail/CVE-2026-100865)
- [https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h](https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h)
- [https://www.vulncheck.com/advisories/heym-before-0.0.53-multiple-rce-and-authentication-bypass-vulnerabilities](https://www.vulncheck.com/advisories/heym-before-0.0.53-multiple-rce-and-authentication-bypass-vulnerabilities)
- [https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83](https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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