Vulnerability · Published Oct 5, 2026 · Assigned by GRAFANA

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

Medium 6.5

In plain English

A medium-severity path traversal in mcp-k6 from Grafana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 67.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
Grafana	mcp-k6	0.3.0 – before 0.7.0

Weakness: CWE-22, CWE-424 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://grafana.com/security/security-advisories/cve-2026-89039 vendor-advisory