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TI-2025-33979 Aliases CVE-2025-54136

Cursor's Modification of MCP Server Definitions Bypasses Manual Re-approvals

Priority MEDIUM 64CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.

Summary

Cursor is a code editor built for programming with AI. In versions 1.2.4 and below, attackers can achieve remote and persistent code execution by modifying an already trusted MCP configuration file inside a shared GitHub repository or editing the file locally on the target's machine. Once a collaborator accepts a harmless MCP, the attacker can silently swap it for a malicious command (e.g., calc.exe) without triggering any warning or re-prompt. If an attacker has write permissions on a user's active branches of a source repository that contains existing MCP servers the user has previously approved, or allows an attacker has arbitrary file-write locally, the attacker can achieve arbitrary code execution. This is fixed in version 1.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.31501 98th percentileScored 2026-11-07
Fix Fixed cursor (cursor): 1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
cursorcursorbefore 1.31.3Patch availableCNA
  • cursor Vendorcursor Affected before 1.3 Fixed in 1.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:anysphere:cursor:*:*:*:*:*:*:*:*before 1.3Vulnerablecursor
  • cpe:2.3:a:anysphere:cursor:*:*:*:*:*:*:*:* Versions before 1.3 Vulnerable ·cursor

Remediation

  • Fix · CNA cursor (cursor) Fixed in 1.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-54136

References

Advisory 1

  • TI-2026-45043 Cursor for Windows 3.2.16 RCE via Malicious git.exe in Workspace CVSS 4.0HIGH 8.7
  • TI-2026-37271 Cursor Desktop sandbox escape via symlink and failed path canonicalization CVSS 4.0CRITICAL 9.3
  • TI-2026-37270 Cursor Desktop sandbox escape via agent-controlled working directory CVSS 4.0CRITICAL 9.3
  • TI-2025-38037 Cursor CLI's Cursor Agent MCP OAuth2 Communication is Vulnerable to Remote Code Execution CVSS 3.1HIGH 8.8
  • TI-2025-33978 Cursor Agent is vulnerable to prompt injection via MCP Special Files CVSS 3.1CRITICAL 9.8
  • TI-2026-21238 Cursor sandbox escape via Git hooks CVSS 3.1CRITICAL 9.9
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences