{"data":{"id":"4b3eff19-540b-44e1-94d9-5721f5a062f6","title":"CVE-2026-4270 - AWS API MCP File Access Restriction Bypass","summary":"CVE-2026-4270 is an Improper Protection of Alternate Path flaw in the no-access and workdir file access features of the AWS API MCP Server, affecting awslabs.aws-api-mcp-server versions >= 0.2.14 and < 1.3.9 on all platforms. The flaw may allow an attacker to bypass the intended file access restriction and expose arbitrary local file contents in the MCP client application context.","solution":"N/A -- no mitigation discussed in source.","labels":["security"],"sourceUrl":"https://aws.amazon.com/security/security-bulletins/rss/2026-007-aws/","publishedAt":"2026-03-16T16:31:30.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"high","attackType":["other"],"issueType":"vulnerability","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["Amazon"],"affectedVendorsRaw":["AWS API MCP Server","awslabs.aws-api-mcp-server","Model Context Protocol (MCP)"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-03-16T16:31:30.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["confidentiality"],"aiComponentTargeted":"plugin","llmSpecific":false,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":null,"fixes":[]}}