# CVE-2026-89039: Arbitrary file read via the convert_playwright_script prompt in mcp-k6

> CVE-2026-89039: Arbitrary file read via the convert_playwright_script prompt in mcp-k6. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-89039
Last updated: 2026-10-06T16:08:43Z

- Published: 2026-10-05 14:52 UTC · Updated: 2026-10-06 16:08 UTC · Assigner: GRAFANA
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.38%, 32th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-22, CWE-424

## Description

A caller who can invoke the convert\_playwright\_script prompt in mcp-k6 can pass a bare file path as the playwright\_script argument and receive the contents of any file readable by the user running the server, including SSH keys and cloud credentials in that user's home directory (path traversal). The working-directory restriction applied to '@'-prefixed paths can also be bypassed with a symbolic link inside the working directory that points outside it.

## Affected vendors and products

- Grafana: mcp-k6

## Tracked companies

- [Grafana Cloud](https://rewindex.com/company/grafana-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-89039)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-89039)
- [https://grafana.com/security/security-advisories/cve-2026-89039](https://grafana.com/security/security-advisories/cve-2026-89039)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-89039 · Markdown: https://rewindex.com/cve/CVE-2026-89039.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-89039 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:14:00.787Z