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Back to active CVEs
High · CVSS 7.3CVE-2026-115413

AWS API MCP Server OAuth Token Audience Validation BypassCVE-2026-115413

Answer in brief

CVE-2026-115413 records a High severity (CVSS 7.3) vulnerability in AWS API MCP Server OAuth Token Audience Validation Bypass. The current sources do not mark it as known exploited. The current feed maps AWS/aws-api-mcp-server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 27, 2026Updated Oct 27, 2026Source checked Oct 27, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AWS/aws-api-mcp-server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
AWS/aws-api-mcp-servergeneric>=1.3.0 <1.6.01.6.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for AWS/aws-api-mcp-server.
  2. 2Review the reported fix. Update AWS/aws-api-mcp-server to 1.6.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 27, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • Source referencepypi.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Oct 27, 2026
References
3 linked sources
Open source record