CVE-2026-67349

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductOpencost

PublishedJul 30, 2026

First seenJul 30, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

opencost opencost1.121.0 or later

Patches

Vendor advisories

github.com/opencost/opencost/releases/tag/core/v1.121.0

Affected products

Product	Affected versions	Fixed in
opencost opencost	v < 1.121.0	1.121.0

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