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CVE-2025-54135— Cursor Agent is vulnerable to prompt injection via MCP Special Files

Quick assessment

Affected
cursor cursor
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cursor是Cursor开源的一个 AI 代码编辑器。 Cursor 1.3.9之前版本存在安全漏洞，该漏洞源于允许未经用户批准写入工作区文件，可能导致远程代码执行。

CVSS 8.6 · High EPSS 1.75% · P76
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I. Basic Information for CVE-2025-54135

Vulnerability Information
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Vulnerability Title
Cursor Agent is vulnerable to prompt injection via MCP Special Files
Source: CVE Program / CVE List V5
Vulnerability Description
Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Cursor 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cursor是Cursor开源的一个 AI 代码编辑器。 Cursor 1.3.9之前版本存在安全漏洞，该漏洞源于允许未经用户批准写入工作区文件，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cursor cursor < 1.3.9 -

II. Public POCs for CVE-2025-54135

# POC Description Source Link Shenlong Link
1 None https://github.com/allinsthon/CVE-2025-54135 POC Details
2 A repo for CVE-2025-54135 reproduction https://github.com/Cbdlll/test-mcp POC Details
3 None https://github.com/anntsmart/CVE-2025-54135 POC Details
4 A repo for CVE-2025-54135 reproduction https://github.com/hn1e13/test-mcp POC Details
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III. Intelligence Information for CVE-2025-54135

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IV. Related Vulnerabilities

Same product: cursor
Same vendor: cursor
Same weakness: CWE-78

V. Comments for CVE-2025-54135

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