CVE-2026-67349

HIGH

OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass

Title source: cna

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.

References (5)

Core 5

Core References

Exploit technical-description exploit

Researcher Disclosure

https://github.com/opencost/opencost/issues/3893

Release Notes release-notes

Release Notes

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

Issue Tracking issue-tracking

Pull Request

https://github.com/opencost/opencost/pull/3910

Patch patch

Patch Commit

https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b

View Patch ZIP pw:eip

Third Party Advisory third-party-advisory

https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypass

Scores

CVSS v3 7.5

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-306

Status published

Products (1)

opencost/opencost < 1.121.0

Published Jul 30, 2026

Tracked Since Jul 30, 2026