What is CVE-2026-101049?

CVE-2026-101049 is a medium-severity vulnerability in Heymrun Heym, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-09-27.

How severe is CVE-2026-101049?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Heymrun Heym

CVE-2026-101049

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.

Vulnerability class: Broken Authentication

Published 2026-09-27.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Heymrun Heym

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h (vendor-advisory)
github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83 (patch)
www.vulncheck.com/advisories/heym-before-0.0.53-slack-webhook-signature-verific… (third-party-advisory)

Frequently asked questions

What is CVE-2026-101049?: CVE-2026-101049 is a medium-severity vulnerability in Heymrun Heym, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-09-27.
How severe is CVE-2026-101049?: Medium severity. CVSS v3 base score is 6.5 out of 10.