Grafana MCP K6 0.3.0 Convert Playwright Script Prompt playwright_script path traversal

Summaryinfo

A vulnerability was found in Grafana MCP K6 0.3.0. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component Convert Playwright Script Prompt. The manipulation of the argument playwright_script results in path traversal. This vulnerability is reported as CVE-2026-89039. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in Grafana MCP K6 0.3.0. Affected is some unknown processing of the component Convert Playwright Script Prompt. The manipulation of the argument playwright_script with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. CVE summarizes:

The convert_playwright_script prompt in the k6 MCP server accepts a file path as its playwright_script argument. Paths given in the documented '@'-prefixed form are restricted to the server's current working directory, but a bare path is resolved by a separate undocumented code path that applies no such restriction. A caller able to invoke the prompt can therefore read any file readable by the user running the server, including files outside the working directory, and receives the file contents in the prompt response. A leading '~' is expanded to the user's home directory, so credential files such as SSH private keys are directly addressable. The working-directory restriction is additionally bypassable through a symbolic link inside the working directory that points outside it, because the path is not canonicalized before the restriction is applied. All releases from v0.3.0 onward are affected; releases v0.3.0 and v0.4.0 apply no restriction to either form.

The advisory is available at grafana.com. This vulnerability is traded as CVE-2026-89039 since 09/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/05/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Grafana

Name

• MCP K6

Version

• 0.3.0

License

• open-source

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CPE 2.2info

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