CVE-2026-44300

OpenCost provides cost monitoring for Kubernetes workloads and cloud costs. Prior to 1.121.0, the POST /serviceKey endpoint in pkg/costmodel/router.go allows a network client to invoke AddServiceKey without mandatory authentication and submit an arbitrary key form value that is written to the GCP service-account key.json file returned by GetGCPAuthSecretFilePath in core/pkg/env/core.go. The attacker controls the file contents but not the CONFIG_PATH-derived directory, the key.json filename, or the file mode. Replacing the credential contents can disrupt GCP cost collection or cause OpenCost to use attacker-selected credentials, and the wildcard Access-Control-Allow-Origin response permits browser-assisted requests when the service is reachable from a browser. This issue is fixed in version 1.121.0.

CVSS

No CVSS.

References

Link	Resource
https://github.com/opencost/opencost/commit/69430e7f627b3e62c8999312c06949267fab813a
https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b
https://github.com/opencost/opencost/pull/3651
https://github.com/opencost/opencost/pull/3910
https://github.com/opencost/opencost/releases/tag/v1.120.0
https://github.com/opencost/opencost/releases/tag/v1.121.0
https://github.com/opencost/opencost/security/advisories/GHSA-wmj8-9953-vff5

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-15 18:17

Updated : 2026-09-15 20:17

NVD link : CVE-2026-44300

Mitre link : CVE-2026-44300

CVE.ORG link : CVE-2026-44300

JSON object : View

Products Affected

No product.

CWE

CWE-20

Improper Input Validation

CWE-309

Use of Password System for Primary Authentication

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