{"affected":[{"defaultStatus":"unaffected","product":"aws-api-mcp-server","source":"CNA: AMZN","vendor":"AWS","versions":[{"lessThan":"1.5.1","status":"affected","version":"0.2.13","versionType":"custom"}]}],"cveId":"CVE-2026-125271","cwes":["CWE-1025","CWE-863"],"description":"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.\n\n\n\nTo remediate this issue, users should upgrade to version 1.5.1.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.8,"severity":"high","source":"CNA: AMZN","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},{"score":8.5,"severity":"high","source":"CNA: AMZN","vector":"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","version":"4.0"}],"modifiedAt":1794328538381,"publishedAt":1794328417925,"references":[{"source":"CNA: AMZN","tags":["release-notes","patch"],"url":"https://pypi.org/project/awslabs.aws-api-mcp-server/1.5.1/"},{"source":"CNA: AMZN","tags":["vendor-advisory"],"url":"https://aws.amazon.com/security/security-bulletins/2026-176-aws/"},{"source":"CNA: AMZN","tags":["third-party-advisory"],"url":"https://github.com/awslabs/mcp/security/advisories/GHSA-4wq9-grf3-qg2p"}],"remediation":[{"kind":"fix","source":"CNA: AMZN","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://pypi.org/project/awslabs.aws-api-mcp-server/1.5.1/"}],"revision":"46e3742de4d8714b959955446c392e8e5b42f76cad14a7e82686f23b3f3d013c","sources":[{"modifiedAt":1794328538381,"name":"CNA: AMZN","retrievedAt":1794330621762,"url":"https://www.cve.org/CVERecord?id=CVE-2026-125271"}],"ssvc":null,"status":"published","title":"AWS API MCP Server Security Policy Bypass via Incorrect Operation Name Normalization","updatedAt":1794330621762}