External risk intelligence

Cursor Command Injection Vulnerability Allows Arbitrary Code Execution.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-62354

Cursor is a desktop-based integrated development environment (IDE) used primarily on local workstations by developers. It is not designed to be an internet-facing service, web server, or network gateway, making public internet exposure of this vulnerable component in a typical deployment highly unlikely.

OS Command Injection

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in Cursor, a developer tool, allows for unauthorized command execution, potentially leading to arbitrary code execution. The main concern is confirming if this tool is used within your environment and if it presents any exposure.

Unrestricted commands can run code.
Confirm if this developer tool is in use.
Assess usage and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted input to the Cursor application. This input could be processed in a way that allows arbitrary commands to be executed on the system, bypassing security restrictions and potentially leading to the compromise of the underlying operating system.

No special access required.
Input processed by the application.
Arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

An attacker could exploit this vulnerability to run arbitrary commands on a system when the affected software is running and accessible over a network. This could potentially impact the integrity and availability of the system by allowing unauthorized code execution.

Arbitrary code execution on affected systems.
Network access could allow command injection.
System compromise and unauthorized operations.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Cursor, an IDE likely deployed on individual developer workstations, points to ownership by development teams or platform engineers responsible for developer tooling. The immediate first step is to confirm its presence and accessibility within your environment. Then, identify the accountable owner and assess the risk to prioritize remediation actions, considering factors like business criticality and potential exposure.

Ownership: Development or platform engineering teams.
Verify: Presence and accessibility of Cursor.
Action: Assess risk and plan remediation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is Cursor and how is it used?

Cursor is an integrated development environment (IDE) built for software developers. It functions as a local application on a developer's workstation to assist in writing, editing, and managing code projects. Unlike server software, it is not a public-facing network service.

What does command injection mean in CVE-2025-62354?

This CVE involves CWE-78, which is the failure to properly sanitize input before passing it to an operating system. Because Cursor does not correctly neutralize special characters, an attacker can supply malicious instructions that the system executes instead of the intended software commands.

How can an attacker trigger this vulnerability?

An attacker must provide specially crafted input that the Cursor application processes. Simply having the software installed is not enough; the application must be running and actively processing the malicious input. It does not trigger from passive file viewing or idle states.

Do I need to worry about this if I use Cursor internally?

According to Halo Surface Signal, Cursor is typically a local desktop tool rather than a network gateway, making public internet exposure highly unlikely. Focus your concern on local workstations where developers interact with untrusted inputs or projects.

Why should I prioritize investigating this IDE?

Because this flaw allows for arbitrary code execution, it poses a severe risk to the local system. Your first step should be to identify where Cursor is installed in your environment, confirm which development teams manage it, and ensure the software is updated.

References

hiddenlayer.com/sai_security_advisor/2025-11-cursor/

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.