Unrated severityNVD Advisory· Published Jul 30, 2026· Updated Jul 31, 2026
OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass
CVE-2026-67349
Description
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.
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Affected products
1Patches
Vulnerability mechanics
References
5- github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851bmitrepatch
- github.com/opencost/opencost/pull/3910mitreissue-trackingpatch
- github.com/opencost/opencost/issues/3893mitretechnical-descriptionexploitissue-tracking
- www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypassmitrethird-party-advisory
- github.com/opencost/opencost/releases/tag/core/v1.121.0mitrerelease-notes
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