{"data":{"id":"52df124b-2cb9-456c-b1c8-6d78be4e3889","title":"GHSA-j8g8-j7fc-43v6: Flowise has Arbitrary File Upload via MIME Spoofing","summary":"The `/api/v1/attachments/:chatflowId/:chatId` endpoint in Flowise is listed in `WHITELIST_URLS`, so it accepts uploads without authentication. The server checks uploads against the MIME types in `chatbotConfig.fullFileUpload.allowedUploadFileTypes` but trusts the client-supplied `Content-Type` header without checking file contents or extension. An attacker can upload scripts or other arbitrary files by declaring a permitted type such as `application/pdf`, and the files persist in backend storage. Chained with static hosting or file retrieval, this can lead to Stored XSS, malicious file hosting, or Remote Code Execution.","solution":"N/A -- no mitigation discussed in source.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-j8g8-j7fc-43v6","publishedAt":"2026-03-06T18:49:20.000Z","cveId":"CVE-2026-30821","cweIds":null,"cvssScore":null,"cvssSeverity":"high","severity":"high","attackType":["other"],"issueType":"vulnerability","affectedPackages":["flowise@<= 3.0.12 (fixed: 3.0.13)"],"affectedPackageNames":["flowise"],"affectedPackageRefs":["npm:flowise"],"affectedVendors":[],"affectedVendorsRaw":["Flowise"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0.16712,"epssCheckedAt":"2026-11-04T06:10:14.970Z","kevDateAdded":null,"advisoryAliases":["GHSA-j8g8-j7fc-43v6"],"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":null,"fixReleasedAt":"2026-02-03T14:06:55.481Z","daysToFix":-31,"fixCheckedAt":"2026-10-29T21:40:08.470Z","capecIds":null,"crossRefCount":0,"attackSophistication":"trivial","impactType":["integrity","confidentiality"],"aiComponentTargeted":"plugin","llmSpecific":false,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":null,"fixes":[{"ecosystem":"npm","name":"flowise","fixedVersion":"3.0.13","matchedVersion":"3.0.13","fixReleasedAt":"2026-02-03T14:06:55.481Z","daysToFix":-31,"match":"ecosystem","source":"tracked","status":"found","checkedAt":"2026-10-29T21:40:08.323Z"}]}}