Medium severity · published Oct 5, 2026
CVE-2026-89039
Arbitrary file read via the convert_playwright_script prompt in mcp-k6
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
0.3.0 before 0.7.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89039
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89039
vendor-advisory
https://grafana.com/security/security-advisories/cve-2026-89039
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