What’s Vulnerable › Vulnerabilities

CVE-2026-67349: OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-07-31
• Weakness: CWE-306

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.

Affected products

• opencost: before 1.121.0 — fixed in 1.121.0

How to fix

Upgrade to a fixed version: opencost 1.121.0. Check the vendor advisory for mitigations.

References

• https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b
• https://github.com/opencost/opencost/issues/3893
• https://github.com/opencost/opencost/pull/3910
• https://github.com/opencost/opencost/releases/tag/core/v1.121.0
• https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypass

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