{"data":{"id":"e5586376-17c4-4614-add3-0d94f7ab92ed","title":"When Neither Side Confirms: Destructive Tool Approval Across MCP Servers and Hosts","summary":"Researchers measured how MCP servers and host applications handle human approval for destructive tool calls, using source code from a 1,000-repository sample of the official MCP registry and 41 open-source hosts and agent SDKs. They found an estimated 90% of destructive tools lack server-side confirmation, and 60.7% of sampled server-application pairs have no enforced human approval by default. In 479 of 960 runs, four of five low-cost models executed an injected deletion through four agent SDKs.","solution":"Applications should therefore configure approval. The source estimates that prompting for every tool not annotated read-only or non-destructive would cut the unapproved share of pairs to 5.4%, while universal elicitation support would leave 56.7%.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2611.02527v1","publishedAt":"2026-11-02T04:57:42.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["other"],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["Model Context Protocol (MCP)","MCP servers","MCP hosts","agent SDKs","low-cost LLMs"],"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":"2026-11-02T04:57:42.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity","availability"],"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.9,"researchCategory":"preprint","atlasIds":null}}