Auth bypass in Heymrun Heym
CVE-2026-110873
Heym from 0.0.55 before 0.0.121 contains a privilege escalation vulnerability that allows shared collaborators to overwrite a workflow's error_workflow_id because the field is missing from OWNER_ONLY_EXECUTION_FIELDS. Attackers can point the error workflow to their own workflow with an HTTP node, and when the parent workflow errors the owner's decrypted credentials are injected and exfiltrated.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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
Weakness classification (CWE)
References
- github.com/heymrun/heym/security/advisories/GHSA-c3f4-2mrj-jfqr (vendor-advisory)
- www.vulncheck.com/advisories/heym-0.0.55-before-0.0.121-credential-theft-via-er… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110873?
- CVE-2026-110873 is a high-severity vulnerability in Heymrun Heym, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-10-14.
- How severe is CVE-2026-110873?
- High severity. CVSS v3 base score is 7.1 out of 10.