OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass

Advisories

severity: high
date: 7/30/2026
Affecting: opencost < 1.121.0
CVE: CVE-2026-67349
CWE: CWE-306 Missing Authentication for Critical Function
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References: Researcher Disclosure
Release Notes
Pull Request
Patch Commit
Credit: George Chen
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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