CVE-2026-67349

OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass

State: Published
Severity: 8.7 High
Published: Jul 30, 2026
Updated: Jul 31, 2026
Reserved: Jul 29, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
opencostopencost	before 1.121.0Affected

References

Researcher Disclosuretechnical-descriptionexploitissue-tracking
OpenCost core/v1.121.0 Release Notesrelease-notes
Pull Requestissue-trackingpatch
Patch Commitpatch
https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypassthird-party-advisory

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