CVE-2026-16584

AWS API MCP Server Security Policy Bypass via Startup Failure

Published Jul 23, 2026 CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Description
Improper handling of an initialization failure in AWS API MCP Server from 0.2.13 through 1.3.46 might allow an actor to bypass the user-configured security policy and execute AWS API operations that the policy was set to deny or gate. When initialization of the security policy enforcement data fails at server startup, the policy check is skipped for the lifetime of the process. IAM permissions on the configured credentials remain in effect and are unaffected.



To remediate this issue, users should upgrade to version 1.3.47.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-29w2-fq35-v728 AWS API MCP Server Security Policy Bypass via Startup Initialization Failure
History
Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper handling of an initialization failure in AWS API MCP Server from 0.2.13 through 1.3.46 might allow an actor to bypass the user-configured security policy and execute AWS API operations that the policy was set to deny or gate. When initialization of the security policy enforcement data fails at server startup, the policy check is skipped for the lifetime of the process. IAM permissions on the configured credentials remain in effect and are unaffected. To remediate this issue, users should upgrade to version 1.3.47.
Title AWS API MCP Server Security Policy Bypass via Startup Failure
First Time appeared Aws
Aws aws-api-mcp-server
Weaknesses CWE-455
CPEs cpe:2.3:a:aws:aws-api-mcp-server:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws-api-mcp-server
References
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Jul 23, 2026, 6:16 PM
Reserved
Jul 22, 2026, 1:43 PM
Status
Awaiting Analysis
Published
Jul 23, 2026, 4:17 PM
Modified
Oct 24, 2026, 1:10 PM