PT-2026-66679 · Comfy Org · Comfyui

CVE-2026-56672 · Published 2026-07-31 · Updated 2026-07-31

NVD

CVSS v3.1

8.2

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-56672

Affected Products

Comfyui

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-56672 · Security Note
• https://github.com/Comfy-Org/ComfyUI/commit/96e0e3585b41e1417442eaa14ec57f7b4ffcb5e0 · Note
• https://github.com/Comfy-Org/ComfyUI/releases/tag/v0.28.0 · Note
• https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-53g8-45wq-pcv8 · Note