Vulnerability · Published Jul 30, 2026 · Assigned by VulnCheck

CVE-2026-67349OpenCost < 1.121.0 Unauthenticated Helm Values Exposure and Admin Bypass

High 7.5

In plain English

A high-severity missing authentication in opencost from opencost. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 57.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
opencost	opencost	0 – before 1.121.0

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Researcher Disclosure technical-description, exploit, issue-tracking
OpenCost core/v1.121.0 Release Notes release-notes
Pull Request issue-tracking, patch
Patch Commit patch
https://www.vulncheck.com/advisories/opencost-unauthenticated-helm-values-exposure-and-admin-bypass third-party-advisory