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CVE-2025-54135

Cursor Agent is vulnerable to prompt injection via MCP Special Files

Published: Aug 5, 2025Updated: Aug 25, 2025 Sources: CVE List NVD BDUCWE-78
NVD MITRE
8.5CVSSHIGH
EPSS Score
1.7%
Top 25.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-78CWE-829

Affected Products

cursoranysphere
SaaS
AI / ML / ai-agent-tooling
CursorAnysphere, Inc.
SaaS
Cloud & SaaS / saas-application
cursorcursor
Mixed
DevTools & CI / ide-editor
anyspherecommercialAI / MLaka anysphere ai
anysphere, inc.commercialCloud & SaaS
cursorcommercialUSDevTools & CIaka cursor ai

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm
github.com
https://cursorhistory.com/versions/1.3.9
cursorhistory.com
https://www.securitylab.ru/news/562050.php
securitylab.ru
and 4 more references View all →

Timeline

Published
Aug 5, 2025
Last Updated
Aug 25, 2025
News mentions
1

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