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CVE-2026-16584

AWS API MCP Server Security Policy Bypass via Startup Failure

Published: Jul 23, 2026Updated: Jul 23, 2026 Sources: CVE List NVDCWE-455
7.0HIGH
NVD MITRE
EPSS Score
0.1%
Top 97.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-455

Affected Products

AWS
commercial·US
aws-api-mcp-serverMixed
Cloud & SaaS / cloud-platform

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.47/
pypi.org
https://aws.amazon.com/security/security-bulletins/2026-063-aws/
aws.amazon.com
https://github.com/awslabs/mcp/security/advisories/GHSA-29w2-fq35-v728
github.com

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