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CVE-2026-56670— ComfyUI: Stored XSS via SVG file upload on the /view endpoint

Quick assessment

Affected
Comfy-Org ComfyUI
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ComfyUI 是一个采用图形/节点接口的模块化扩散模型图形用户界面、API 和后端系统。在版本 0.28.0 之前，/view 端点会以内联方式提供上传的 SVG 文件，因为系统在处理危险内容类型时未包含 image/svg+xml 及相关 XML 内容类型，从而导致在 ComfyUI 源域中存在存储型跨站脚本（XSS）漏洞。该问题已在 0.28.0 版本中得到修复。

CVSS 8.2 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Comfy-Org ComfyUI < 0.28.0 affected
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I. Basic Information for CVE-2026-56670

Vulnerability Information
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Vulnerability Title
ComfyUI: Stored XSS via SVG file upload on the /view endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
ComfyUI is a modular diffusion model GUI, api and backend with a graph/nodes interface. Prior to 0.28.0, the /view endpoint served uploaded SVG files inline because image/svg+xml and related XML content types were absent from the dangerous-content-type handling, allowing stored cross-site scripting in the ComfyUI origin. This issue is fixed in version 0.28.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Comfy-Org ComfyUI < 0.28.0 -

II. Public POCs for CVE-2026-56670

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8469 chars
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III. Intelligence Information for CVE-2026-56670

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Vendor Advisories for CVE-2026-56670 (1)

Other References for CVE-2026-56670 (1)

Same Patch Batch · Comfy-Org · 2026-07-31 · 5 CVEs total

CVE-2026-68771 9.8 CRITICAL ComfyUI 0.23.0 Unauthenticated RCE via LoadTrainingDataset Pickle Deserialization
CVE-2026-56672 8.2 HIGH ComfyUI: Stored XSS via /userdata/{file} due to Missing Content-Type Sanitization
CVE-2026-56673 7.5 HIGH ComfyUI: Path traversal in LoadImage via the /prompt API allows arbitrary file existence p
CVE-2026-56671 7.5 HIGH ComfyUI: Path traversal in /experiment/models/preview allows arbitrary image file read

IV. Related Vulnerabilities

Same product: ComfyUI
Same vendor: Comfy-Org
Same weakness: CWE-79

V. Comments for CVE-2026-56670

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