CVE-2026-115413: Missing token audience validation in the OAuth authentication mode of AWS API MCP Server before version 1.6.0

Routine

HIGH 7.8WATCHLIST

CVE-2026-115413 is a high-severity flaw (CVSS 7.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-346
Published	2026-10-27
Last modified	2026-10-27

Publisher (CNA): AMZN

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-10-27 19:17 UTCPublished CVE record published
2026-10-27 19:17 UTCUpdated Record last modified

Advisories and coverage

Official advisories

AWS Security Bulletins: CVE-2026-115413 - AWS API MCP Server OAuth token audience validation bypass 2026-10-27

Research and news

Vulners Bulletins: CVE-2026-115413 2026-10-27

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-115413?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-115413 being exploited?

CVE-2026-115413 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-115413 affect?

CVE-2026-115413 affects affected software. Severity is high (CVSS 7.8). 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 a

How urgent is CVE-2026-115413?

Priority 32/100. High severity; On your watchlist

Software pages

AWS vulnerabilities

References

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