Cursor
Vulnerability Report

Nov 26, 2025

Allowlist Bypass in Run Terminal Tool Allows Arbitrary Code Execution During Autorun Mode

CVE Number

CVE-2025-62354

Summary

When in autorun mode with the secure ‘Follow Allowlist’ setting, Cursor checks commands sent to run in the terminal by the agent to see if a command has been specifically allowed. The function that checks the command has a bypass to its logic, allowing an attacker to craft a command that will execute non-whitelisted commands.

Products Impacted

This vulnerability is present in Cursor v1.3.4 up to but not including v2.0.

CVSS Score: 9.8

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE Categorization

CWE-78: Improper Neutralization of Special Elements used in an OS Command (‘OS Command Injection’)

Details

Cursor’s allowlist enforcement could be bypassed using brace expansion when using zsh or bash as a shell. If a command is allowlisted, for example, `ls`, a flaw in parsing logic allowed attackers to have commands such as `ls $({rm,./test})` run without requiring user confirmation for `rm`. This allowed attackers to run arbitrary commands simply by prompting the cursor agent with a prompt such as:

run:

ls $({rm,./test})

Timeline

July 29, 2025 – vendor disclosure and discussion over email – vendor acknowledged this would take time to fix

August 12, 2025 – follow up email sent to vendor

August 18, 2025 – discussion with vendor on reproducing the issue

September 24, 2025 – vendor confirmed they are still working on a fix

November 04, 2025 – follow up email sent to vendor

November 05, 2025 – fix confirmed

November 26, 2025 – public disclosure

Quote from Vendor:

“We appreciate HiddenLayer for reporting this vulnerability and working with us to implement a fix. The allowlist is best-effort, not a security boundary and determined agents or prompt injection might bypass it. We recommend using the sandbox on macOS and are working on implementations for Linux and Windows currently.”

Project URL

https://cursor.com/home

Researcher: Kasimir Schulz, Director of Security Research, HiddenLayer

Researcher: Kenneth Yeung, Senior AI Security Researcher, HiddenLayer

HiddenLayer, a Gartner-recognized Cool Vendor for AI Security, is the leading provider of Security for AI. Its AISec Platform unifies supply chain security, runtime defense, posture management, and automated red teaming to protect agentic, generative, and predictive AI applications. The platform enables organizations across the private and public sectors to reduce risk, ensure compliance, and adopt AI with confidence.

Founded by a team of cybersecurity and machine learning veterans, HiddenLayer combines patented technology with industry-leading research to defend against prompt injection, adversarial manipulation, model theft, and supply chain compromise. The company is backed by strategic investors including M12 (Microsoft’s Venture Fund), Moore Strategic Ventures, Booz Allen Ventures, IBM Ventures, and Capital One Ventures.