{"id":"CVE-2026-56672","state":"PUBLISHED","title":"ComfyUI: Stored XSS via /userdata/{file} due to Missing Content-Type Sanitization","description":"ComfyUI is a node-based diffusion model GUI, API, and backend. Prior to 0.28.0, GET /userdata/{file} served user-controlled HTML and SVG files with extension-derived content types, allowing stored cross-site scripting in the ComfyUI origin and access to browser-stored API tokens, settings, workflows, and authenticated-equivalent API calls. The handler used web.FileResponse(path), so an uploaded .html/.svg was served as text/html/image/svg+xml. POST /userdata stores arbitrary request bodies (confined to the user's userdata directory). When a victim navigated to the file URL, the embedded script executed same-origin. The /view endpoint already forced dangerous MIME types to download; that protection had never been applied to /userdata. This issue is fixed in version 0.28.0.","publishedAt":"2026-07-31T04:27:18.721Z","updatedAt":"2026-07-31T11:06:19.744Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["Comfy-Org ComfyUI"],"affected":[{"vendor":"Comfy-Org","product":"ComfyUI","versions":[{"version":"< 0.28.0","status":"affected"}]}],"references":["https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-53g8-45wq-pcv8","https://github.com/Comfy-Org/ComfyUI/commit/96e0e3585b41e1417442eaa14ec57f7b4ffcb5e0","https://github.com/Comfy-Org/ComfyUI/releases/tag/v0.28.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/56xxx/CVE-2026-56672.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56672","state":"PUBLISHED","datePublished":"2026-07-31T04:27:18.721Z","dateUpdated":"2026-07-31T11:06:19.744Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-22T16:39:01.043Z"},"containers":{"cna":{"title":"ComfyUI: Stored XSS via /userdata/{file} due to Missing Content-Type Sanitization","descriptions":[{"lang":"en","value":"ComfyUI is a node-based diffusion model GUI, API, and backend. Prior to 0.28.0, GET /userdata/{file} served user-controlled HTML and SVG files with extension-derived content types, allowing stored cross-site scripting in the ComfyUI origin and access to browser-stored API tokens, settings, workflows, and authenticated-equivalent API calls. The handler used web.FileResponse(path), so an uploaded .html/.svg was served as text/html/image/svg+xml. POST /userdata stores arbitrary request bodies (confined to the user's userdata directory). When a victim navigated to the file URL, the embedded script executed same-origin. The /view endpoint already forced dangerous MIME types to download; that protection had never been applied to /userdata. This issue is fixed in version 0.28.0."}],"affected":[{"vendor":"Comfy-Org","product":"ComfyUI","versions":[{"version":"< 0.28.0","status":"affected"}]}],"references":[{"url":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-53g8-45wq-pcv8","name":"https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-53g8-45wq-pcv8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Comfy-Org/ComfyUI/commit/96e0e3585b41e1417442eaa14ec57f7b4ffcb5e0","name":"https://github.com/Comfy-Org/ComfyUI/commit/96e0e3585b41e1417442eaa14ec57f7b4ffcb5e0","tags":["x_refsource_MISC"]},{"url":"https://github.com/Comfy-Org/ComfyUI/releases/tag/v0.28.0","name":"https://github.com/Comfy-Org/ComfyUI/releases/tag/v0.28.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-31T04:27:18.721Z"},"source":{"advisory":"GHSA-53g8-45wq-pcv8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T11:06:11.409441Z","id":"CVE-2026-56672","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-31T11:06:19.744Z"}}]}}}