CVE-2026-125271: AWS API MCP Server Security Policy Bypass via Incorrect Operation Name Normalization
AWS · aws-api-mcp-server
Fixed in 1.5.1 · Affected: aws-api-mcp-server before 1.5.1 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 31% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- AWS · aws-api-mcp-serverfrom 0.2.13 before 1.5.1
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- AWS
- Published
- November 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-125271 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.