What’s Vulnerable › Vulnerabilities

CVE-2026-115413: AWS API MCP Server OAuth Token Audience Validation Bypass

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-28
• Weakness: CWE-346

Description

Missing token audience validation in the OAuth authentication mode of AWS API MCP Server before version 1.6.0 might allow local users to run AWS operations with the server's configured AWS credentials via an access token issued to another application by the same identity provider. To remediate this issue, users should upgrade to version 1.6.0 and configure the expected token audience or client ID for the server.

Affected products

• aws-api-mcp-server: from 1.3.0 before 1.6.0 — fixed in 1.6.0

How to fix

Upgrade to a fixed version: aws-api-mcp-server 1.6.0. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-152-aws/
• https://github.com/awslabs/mcp/security/advisories/GHSA-4prq-p2x5-w9fh
• https://pypi.org/project/awslabs.aws-api-mcp-server/1.6.0/

Get alerted when CVE-2026-115413 or the next vulnerability affects your stack