CVE-2025-54136Public exploitNetwork attack vector

Persistent code execution via stale MCP approval

Published Aug 1, 2025 · Updated Aug 4, 2025

Trust bypass in Anysphere Cursor 1.2.4 and earlier allows remote authenticated users to execute arbitrary code via modified MCP files. Cursor binds approval to an mcpServers entry name without checking whether its command or arguments change, so altered definitions execute silently. Exploitation requires prior approval of the entry and later repository write access or arbitrary local file-write access, yielding persistent execution in the user's context.

CVSS severity7.2
High
EPSS probability27.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Trust bypass in Anysphere Cursor 1.2.4 and earlier allows remote authenticated users to execute arbitrary code via modified MCP files. Cursor binds approval to an mcpServers entry name without checking whether its command or arguments change, so altered definitions execute silently. Exploitation requires prior approval of the entry and later repository write access or arbitrary local file-write access, yielding persistent execution in the user's context.

The record

CVE
CVE-2025-54136
Published
Aug 1, 2025
Updated
Aug 4, 2025
Vendor
Anysphere
Product
Cursor
Classifications
CWE-78, CWE-494, T1059, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Anysphere · Cursorversion=< 1.3

Published CVSS scores

7.2GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-494Download of Code Without Integrity Check
T1059Command and Scripting Interpreter
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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