CVE-2026-53766
chrome-devtools-mcp: validatePath() does not canonicalize symlinks before enforcing roots
Description
Chrome DevTools for agents (chrome-devtools-mcp) lets your coding agent control and inspect a live Chrome browser. From 0.24.0 until 1.1.0, McpContext.validatePath() enforces workspace roots by checking whether path.resolve(filePath) textually falls under one of the configured root paths. path.resolve() does not canonicalize symbolic links. As a result, a symlink inside a configured workspace root can point to a file outside that root, pass validation, and then be followed by downstream file read/write operations. This bypass applies even when the MCP client correctly declares the roots capability with a non-empty list. It is separate from the documented legacy behavior where missing roots capability allows all paths. The practical impact is a workspace-boundary bypass. In the write direction, filePath-writing tools can overwrite out-of-root files through an in-root symlink. In the read direction, upload_file can read through the symlink and send the file to the currently selected web page. This vulnerability is fixed in 1.1.0.
INFO
Published Date :
June 24, 2026, 10:16 p.m.
Last Modified :
Oct. 25, 2026, 11:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-53766
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.
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
- Update the Chrome DevTools for agents package.
- Ensure the package version is 1.1.0 or greater.
Public PoC/Exploit Available at Github
CVE-2026-53766 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2026-53766.
| URL | Resource |
|---|---|
| https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-8qf9-62x2-82pp | Exploit Third Party Advisory |
| https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-8qf9-62x2-82pp | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53766 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-2026-53766
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).
The Project shares all information on MCP related CVE's published
mcp mcp-security mcp-cve
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53766 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53766 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 Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: chrome-devtools-mcp de ChromeDevTools, Description: Chrome DevTools para agentes (chrome-devtools-mcp) permite que su agente de codificación controle e inspeccione un navegador Chrome en vivo. Desde 0.24.0 hasta 1.1.0, McpContext.validatePath() aplica las raíces del espacio de trabajo al verificar si path.resolve(filePath) cae textualmente bajo una de las rutas raíz configuradas. path.resolve() no canoniza enlaces simbólicos. Como resultado, un enlace simbólico dentro de una raíz de espacio de trabajo configurada puede apuntar a un archivo fuera de esa raíz, pasar la validación y luego ser seguido por operaciones de lectura/escritura de archivos posteriores. Esta omisión se aplica incluso cuando el cliente MCP declara correctamente la capacidad de raíces con una lista no vacía. Está separado del comportamiento heredado documentado donde la capacidad de raíces faltante permite todas las rutas. El impacto práctico es una omisión del límite del espacio de trabajo. En la dirección de escritura, las herramientas de escritura de filePath pueden sobrescribir archivos fuera de la raíz a través de un enlace simbólico dentro de la raíz. En la dirección de lectura, upload_file puede leer a través del enlace simbólico y enviar el archivo a la página web actualmente seleccionada. Esta vulnerabilidad está corregida en 1.1.0. -
Initial Analysis by [email protected]
Jun. 26, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:google:chrome-devtools-mcp:*:*:*:*:*:node.js:*:* versions from (including) 0.24.0 up to (excluding) 1.1.0 Added Reference Type GitHub, Inc.: https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-8qf9-62x2-82pp Types: Exploit, Third Party Advisory Added Reference Type CISA-ADP: https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-8qf9-62x2-82pp Types: Exploit, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-8qf9-62x2-82pp Added SSVC {'id': 'CVE-2026-53766', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-25T23:13:11.013103Z'} -
New CVE Received by [email protected]
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'ChromeDevTools', 'product': 'chrome-devtools-mcp', 'versions': [{'status': 'affected', 'version': '>= 0.24.0, < 1.1.0'}]}] Added Description Chrome DevTools for agents (chrome-devtools-mcp) lets your coding agent control and inspect a live Chrome browser. From 0.24.0 until 1.1.0, McpContext.validatePath() enforces workspace roots by checking whether path.resolve(filePath) textually falls under one of the configured root paths. path.resolve() does not canonicalize symbolic links. As a result, a symlink inside a configured workspace root can point to a file outside that root, pass validation, and then be followed by downstream file read/write operations. This bypass applies even when the MCP client correctly declares the roots capability with a non-empty list. It is separate from the documented legacy behavior where missing roots capability allows all paths. The practical impact is a workspace-boundary bypass. In the write direction, filePath-writing tools can overwrite out-of-root files through an in-root symlink. In the read direction, upload_file can read through the symlink and send the file to the currently selected web page. This vulnerability is fixed in 1.1.0. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L Added CWE CWE-22 Added CWE CWE-59 Added Reference https://github.com/ChromeDevTools/chrome-devtools-mcp/security/advisories/GHSA-8qf9-62x2-82pp