Authentication Bypass in OpenCost Exposing Cloud Provider Credentials
CVE-2026-67349

8.7HIGH

Key Information:

Vendor

Opencost

Status
Opencost
Vendor
CVE Published:
30 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-67349?

The OpenCost application prior to version 1.121.0 exhibits significant security vulnerabilities that jeopardize sensitive information. It fails to authenticate requests to the GET /helmValues endpoint, which allows unauthorized access to base64-decoded HELM_VALUES, potentially revealing critical cloud provider credentials. Furthermore, the adminAuthMiddleware is improperly configured, failing to enforce security checks when the ADMIN_TOKEN is not set. This oversight makes it possible for unauthenticated attackers to exploit the system by modifying Google Cloud Platform (GCP) service account keys through the POST /serviceKey endpoint, enabling them to redirect billing calls and potentially causing severe financial repercussions.

Affected Version(s)

opencost 0 < 1.121.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-67349 - Proof of Concept

References

https://github.com/opencost/opencost/issues/3893
technical-descriptionexploit
https://github.com/opencost/opencost/releases/tag/core/v1...
release-notes
https://github.com/opencost/opencost/pull/3910
issue-tracking

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.