What is CVE-2026-115413?

CVE-2026-115413 is a high-severity vulnerability in AWS Aws-Api-Mcp-Server, classified under Origin Validation Error. CVSS score: 7.8/10. Published 2026-10-27.

How severe is CVE-2026-115413?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in AWS Aws-Api-Mcp-Server

CVE-2026-115413

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.

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

AWS Aws-Api-Mcp-Server

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)

Frequently asked questions

What is CVE-2026-115413?: CVE-2026-115413 is a high-severity vulnerability in AWS Aws-Api-Mcp-Server, classified under Origin Validation Error. CVSS score: 7.8/10. Published 2026-10-27.
How severe is CVE-2026-115413?: High severity. CVSS v3 base score is 7.8 out of 10.