Auth bypass in Opencost
CVE-2026-67349
OpenCost before 1.121.0 fails to authenticate the GET /helmValues endpoint, exposing base64-decoded HELM_VALUES environment variable containing cloud provider credentials. Additionally, adminAuthMiddleware fails open when ADMIN_TOKEN is unset, allowing unauthenticated attackers to modify GCP service account keys via POST /serviceKey to redirect billing calls.
Vulnerability class: Broken Authentication
EPSS: 0.003 (21.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Opencost — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking, technical-description, exploit)
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (issue-tracking, patch)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-67349?
- CVE-2026-67349 is a high-severity vulnerability in Opencost, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-07-30.
- How severe is CVE-2026-67349?
- High severity. CVSS v3 base score is 7.5 out of 10.