CVE-2026-115413
AWS API MCP Server OAuth Token Audience Validation Bypass
- State
- Published
- Severity
- 7.3 High
- Published
- Oct 27, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 22, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.3 High | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | AMZN |
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | AMZN |
Weaknesses
- CWE-346 Origin validation error
Affected Products
| Product | Versions |
|---|---|
aws-api-mcp-serverAWS |
|
References
- https://pypi.org/project/awslabs.aws-api-mcp-server/1.6.0/release-notespatch
- https://github.com/awslabs/mcp/security/advisories/GHSA-4prq-p2x5-w9fhthird-party-advisory
- https://aws.amazon.com/security/security-bulletins/2026-152-aws/vendor-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.