CVE-2026-67349 Details
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.
A vulnerability exists in OpenCost versions prior to 1.121.0, where the GET /helmValues endpoint is not properly authenticated. This oversight allows any network-accessible caller to access the base64-decoded HELM_VALUES environment variable, which may contain sensitive cloud provider credentials. Additionally, the adminAuthMiddleware fails open when the ADMIN_TOKEN is not set, enabling unauthenticated attackers to alter Google Cloud Platform (GCP) service account keys through the POST /serviceKey endpoint, thereby redirecting billing calls to an attacker-controlled account.
Users can set the ADMIN_TOKEN environment variable to secure admin endpoints and prevent unauthorized access. Instructions for updating the token can be found in the OpenCost Helm Chart documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 30, 2026CISA-ADP
Assessed Jul 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b | [email protected] | Source CodeVendor |
| https://github.com/opencost/opencost/issues/3893 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/opencost/opencost/pull/3910 | [email protected] | Issue TrackingVendor |
| https://github.com/opencost/opencost/releases/tag/core/v1.121.0 | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypass | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OpenCost | < 1.121.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 31, 2026 | CVE Modified | CISA-ADP |
| Jul 30, 2026 | New CVE Received | [email protected] |