Is CVE-2026-5059 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-5059, but active exploitation has not been confirmed.

Can CVE-2026-5059 be exploited remotely?

Yes. CVE-2026-5059 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5059?

CVE-2026-5059 has a CVSS score of 9.8 (CRITICAL).

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CRITICALPOC

CVE-2026-5059

CWE-78Published: April 11, 2026· Updated: Apr 13, 2026

9.8

CVSS v3.1

Official Description

aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of the allowed commands list. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the MCP server. Was ZDI-CAN-27969.

NVD Source

Technical Analysis

CVE-2026-5059 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

A proof-of-concept (PoC) exploit exists for CVE-2026-5059. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.