{"id":"CVE-2026-125271","aliases":[],"cve":{"records":[{"id":"CVE-2026-125271","source":"AMZN","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-09T18:28:57.011Z","published":"2026-11-10T16:33:37.925Z","modified":"2026-11-10T16:35:38.381Z"}],"publishers":[{"name":"AMZN","role":"CNA","organizationId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","modified":"2026-11-10T16:35:38.381Z"}],"references":[{"url":"https://pypi.org/project/awslabs.aws-api-mcp-server/1.5.1/","tags":["release-notes","patch"],"source":"AMZN"},{"url":"https://aws.amazon.com/security/security-bulletins/2026-176-aws/","tags":["vendor-advisory"],"source":"AMZN"},{"url":"https://github.com/awslabs/mcp/security/advisories/GHSA-4wq9-grf3-qg2p","tags":["third-party-advisory"],"source":"AMZN"}],"weaknesses":[{"id":"CWE-1025","description":"CWE-1025 Comparison using wrong factors","source":"AMZN"},{"id":"CWE-863","description":"CWE-863 Incorrect authorization","source":"AMZN"}],"applicability":[{"source":"AMZN","statements":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:aws:aws-api-mcp-server:*:*:*:*:*:*:*:*","versionStartIncluding":"0.2.13","versionEndExcluding":"1.5.1"}]}]}]}],"prioritization":[]},"title":"AWS API MCP Server Security Policy Bypass via Incorrect Operation Name Normalization","titleSource":"AMZN","descriptionSource":"AMZN","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1.5.1.","score":8.5,"severity":"high","published":"2026-11-10T16:33:37.925Z","modified":"2026-11-10T16:35:38.381Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"AWS","name":"aws-api-mcp-server","platforms":[],"versions":[{"version":"0.2.13","status":"affected","lessThan":"1.5.1","versionType":"custom"}],"defaultStatus":"unaffected","cpes":[],"source":"AMZN","url":"https://www.cve.org/CVERecord?id=CVE-2026-125271"}],"remediation":[],"references":["https://pypi.org/project/awslabs.aws-api-mcp-server/1.5.1/","https://aws.amazon.com/security/security-bulletins/2026-176-aws/","https://github.com/awslabs/mcp/security/advisories/GHSA-4wq9-grf3-qg2p"],"sources":[{"name":"CVE","id":"CVE-2026-125271","modified":"2026-11-10T16:35:38.381Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-125271"}],"assessments":[{"source":"AMZN","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8},{"source":"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","score":8.5}],"sourceAffected":[],"observedAt":"2026-11-10T16:45:54.905Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:55:32.844Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-11-10T16:40:34.999Z","attemptedAt":"2026-11-10T16:40:34.999Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-10T16:40:34.978Z","attemptedAt":"2026-11-10T16:40:34.978Z"},{"source":"EUVD","status":"no-result","checkedAt":"2026-11-10T16:40:34.511Z","attemptedAt":"2026-11-10T16:40:34.511Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-11-10T16:40:34.978Z","attemptedAt":"2026-11-10T16:40:34.978Z"}],"evidence":[],"aiSummary":{"text":"The AWS API MCP Server before version 1.5.1 has a security policy bypass vulnerability due to incorrect operation name normalization, potentially allowing an actor to execute denied AWS API operations. The weakness is caused by comparison using wrong factors and incorrect authorization. Affected versions include 0.2.13.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-10T16:36:09.214Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-125271"}]}}