{"id":"CVE-2026-44300","title":"OpenCost provides cost monitoring for Kubernetes workloads and cloud costs","summary":"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 s…","severity":"high","cvss":8.8,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","cwe":["CWE-20","CWE-309"],"vendor":"opencost","product":"opencost","affected":["opencost < 1.121.0"],"patched":["github.com/opencost/opencost 1.119.1"],"published":"2026-09-15","updated":"2026-09-15","sourceUpdated":"2026-09-15T20:17:15.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44300","references":[{"url":"https://github.com/opencost/opencost/commit/69430e7f627b3e62c8999312c06949267fab813a","label":"security-advisories@github.com"},{"url":"https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b","label":"security-advisories@github.com"},{"url":"https://github.com/opencost/opencost/pull/3651","label":"security-advisories@github.com"},{"url":"https://github.com/opencost/opencost/pull/3910","label":"security-advisories@github.com"},{"url":"https://github.com/opencost/opencost/releases/tag/v1.120.0","label":"security-advisories@github.com"},{"url":"https://github.com/opencost/opencost/releases/tag/v1.121.0","label":"security-advisories@github.com"},{"url":"https://github.com/opencost/opencost/security/advisories/GHSA-wmj8-9953-vff5","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-wmj8-9953-vff5"}],"tags":["nvd","cve.org","ghsa","go"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-15T19:16:35.644735Z"},"cvssSource":"cna","aliases":["GHSA-wmj8-9953-vff5"],"ecosystem":"go","ingestedAt":"2026-07-14T17:37:27.702Z","epss":0.00415,"epssPercentile":0.35466,"slug":"CVE-2026-44300","body":"## Overview\n\nOpenCost 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-44300)\n\nAffected packages:\n\n- `github.com/opencost/opencost < 1.119.1`\n\nPatched in:\n\n- `github.com/opencost/opencost 1.119.1`\n\nSource: https://github.com/advisories/GHSA-wmj8-9953-vff5","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204361,"id":"CVE-2026-44300","ts":1789494100462,"field":"cvss","old":null,"new":"8.8"}]}