High severity · published Oct 27, 2026
CVE-2026-115413
AWS API MCP Server OAuth Token Audience Validation Bypass
New
7.8
CVSS
–
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
aws-api-mcp-server · AWS
1.3.0 before 1.6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115413
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115413
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-152-aws/
github.com
https://github.com/awslabs/mcp/security/advisories/GHSA-4prq-p2x5-w9fh
pypi.org
https://pypi.org/project/awslabs.aws-api-mcp-server/1.6.0/
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