CVE-2026-5059Network attack vector

Unauthenticated code execution via allowed-command injection

Published Apr 11, 2026 · Updated Apr 11, 2026

OS command injection in Alexei Ledenev AWS MCP Server 1.3.0 allows remote attackers to execute arbitrary code without authentication. The allowed-command-list handler fails to validate a user-supplied string before passing it to a system call, so injected shell syntax becomes executable input. Exposure requires a network-reachable MCP transport, and successful commands run with the MCP server process's host and AWS permissions.

CVSS severity9.8
Critical
EPSS probability1.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Alexei Ledenev AWS MCP Server 1.3.0 allows remote attackers to execute arbitrary code without authentication. The allowed-command-list handler fails to validate a user-supplied string before passing it to a system call, so injected shell syntax becomes executable input. Exposure requires a network-reachable MCP transport, and successful commands run with the MCP server process's host and AWS permissions.

The record

CVE
CVE-2026-5059
Published
Apr 11, 2026
Updated
Apr 11, 2026
Vendor
Alexei Ledenev
Product
AWS MCP Server
Classifications
T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alexei Ledenev · AWS MCP Serverversion=1.3.0

Published CVSS scores

9.8TrendAI Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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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