gcdRadar
archive/Patch now/AIR-2026-1235
closedclosed 31 Jul 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-56672: Stored XSS vulnerability in ComfyUI userdata endpoint

ComfyUI

ComfyUI before version 0.28.0 allowed user-controlled HTML and SVG files to be served with extension-derived content types, leading to stored cross-site scripting and potential token theft. The vulnerability has been addressed in version 0.28.0.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
8.2
EPSS
<0.01 · top 66% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
31 Jul 2026
last update
31 Jul 2026
CVE ids
CVE-2026-56672other records

Timeline · 1

  1. 31 Jul 2026CVE-2026-56672: ComfyUI is a node-based diffusion model GUI, API, and backend.

Sources · 1

Advisories and databases

  1. 2026-07-31
    CVE-2026-56672: ComfyUI is a node-based diffusion model GUI, API, and backend.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-56672

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
xsscomfyui
dates
happened 31 Jul 2026 · first reported 31 Jul 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-56672: Stored XSS vulnerability in ComfyUI userdata endpoint

https://gcdradar.vercel.app/incidents/cve-2026-56672-stored-xss-vulnerability-in-comfyui-userdata · AIR-2026-1235 · closed 2026-07-31

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-07-31
- AI role: Attack on AI
- Products: ComfyUI
- CVE ids: CVE-2026-56672
- CVSS: 8.2

## Summary

ComfyUI before version 0.28.0 allowed user-controlled HTML and SVG files to be served with extension-derived content types, leading to stored cross-site scripting and potential token theft. The vulnerability has been addressed in version 0.28.0.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-07-31: CVE-2026-56672: ComfyUI is a node-based diffusion model GUI, API, and backend. (https://nvd.nist.gov/vuln/detail/CVE-2026-56672)

## Sources

- 2026-07-31 NVD: CVE-2026-56672: ComfyUI is a node-based diffusion model GUI, API, and backend. https://nvd.nist.gov/vuln/detail/CVE-2026-56672

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

Related

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    AI
  2. closed7.5
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    Patch now · Disclosed · since 31 Jul 2026 · CVE-2026-56673

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  3. closed9.8
    ComfyUI + custom nodes CVE-2026-68771: ComfyUI Unsafe Deserialization in Training Dataset Node

    Patch now · Disclosed · since 31 Jul 2026 · CVE-2026-68771

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  4. closed7.5
    ComfyUI + custom nodes CVE-2026-56671: ComfyUI Path Traversal Vulnerability in Model Preview

    Patch now · Disclosed · since 31 Jul 2026 · CVE-2026-56671

    AI
  5. closed8.5
    ComfyUI + custom nodes CVE-2026-92816: ComfyUI path traversal leads to code execution

    Patch now · Disclosed · since 16 Sep 2026 · CVE-2026-92816

    AI
  6. closed4.3
    ComfyUI + custom nodes CVE-2026-6590: Path traversal in ComfyUI model preview endpoint

    Patch now · Disclosed · since 20 Apr 2026 · CVE-2026-6590

    AI