---
cve: "CVE-2026-44300"
severity: "HIGH"
cvss: 8.8
epss: "0.4%"
vendor: "opencost"
kev: false
exploited: false
published: "2026-09-15 18:17:21"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T08:49:40+02:00"
---

# CVE-2026-44300

> 8.8 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 69430e7f627b3e62c8999312c06949267fab813a (Commit)
- a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-44300) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_