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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00286.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
opencost opencost unaffected
Version Status Constraints
0 affected < 1.121.0

No data.

No data.

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Vendors Products
Opencost Subscribe
Opencost Subscribe

Project Subscriptions

Vendors Products
Opencost Subscribe
Opencost Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Fri, 31 Jul 2026 23:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 30 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Opencost
Opencost opencost
Vendors & Products Opencost
Opencost opencost

Thu, 30 Jul 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.7, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-07-31T22:56:13.763Z

Reserved: 2026-07-29T13:36:36.277Z

Link: CVE-2026-67349

cve-icon Vulnrichment

Updated: 2026-07-31T22:56:08.385Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T20:00:14Z

Weaknesses