CVE-2026-89039
CVE-2026-89039 CVE Record
Description
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.
INFO
Published Date :
Oct. 5, 2026, 3:17 p.m.
Last Modified :
Oct. 5, 2026, 4:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-89039
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Sanitize and validate all file path inputs.
- Canonicalize all resolved file paths.
- Enforce directory restrictions strictly.
- Update to a patched version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-89039.
| URL | Resource |
|---|---|
| https://grafana.com/security/security-advisories/cve-2026-89039 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-89039 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-89039
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-89039 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-89039 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 05, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-89039', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-05T15:14:33.272676Z'} -
New CVE Received by [email protected]
Oct. 05, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-22 Added CWE CWE-424 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89039.json">CVE-2026-89039</a> Added Reference https://grafana.com/security/security-advisories/cve-2026-89039