cve.bz

CVE-2026-125271 aws aws-api-mcp-server: Incorrect Authorization

8.5 highEPSS 0.4%

High (8.5) in aws aws-api-mcp-server. EPSS 0.4% estimated probability of exploitation activity in the next 30 days.

On this page
Incorrect normalization of operation names in the custom security policy enforcement in awslabs aws-api-mcp-server before 1.5.1 might allow an actor to execute AWS API operations across AWS services that the operator's security policy was configured to deny or require elicitation for, via calls to operations whose names contain consecutive capital letters. To remediate this issue, users should upgrade to version 1.5.1.

Severity

CVSS 4.0

8.5 high
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.8 high
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
0.4% estimated probability of exploitation activity in the next 30 days; 32nd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWEs
CWE-863 Incorrect Authorization
CWE-1025 Comparison Using Wrong Factors
OWASP Top 10
A01:2025 Broken Access Control
Published
Modified
Assigned by
AMZN (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

Ask an AI about this CVE

ChatGPTClaudeGoogle AI Mode

Show the promptExplain CVE-2026-125271 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-125271?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-125271?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-125271 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.

Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.

Badge for a README or a site

CVE-2026-125271

An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:

[![CVE-2026-125271](https://cve.bz/cve/badge/CVE-2026-125271.svg)](https://cve.bz/cve/CVE-2026-125271)

HTML:

<a href="https://cve.bz/cve/CVE-2026-125271"><img src="https://cve.bz/cve/badge/CVE-2026-125271.svg" alt="CVE-2026-125271"></a>

Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
aws-api-mcp-serverfrom 0.2.13 before 1.5.1

References

Check your stackJSON