CVE-2026-56672

highpriority · track · 0EPSS 0.004 · 34 %ileEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.40% (34th) EPSS
CVSS 8.2 · high
Is it mine?
5 products
Check your exposure
Who says so?
2 sources
enisa_euvd · cisa_csaf_it

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

8.2
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:Nsecondary · CISA US
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:Nsecondary · ENISA EU
v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 4.7
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USCWE-79US
05

affected products (5)

Products and version ranges known to be affected.

06

advisories (1)

Vendor and ecosystem advisories describing this.

  • VA-26-238-01ComfyUI stored XSS and path traversal vulnerabilities2026-08-26csaf · cisa_csaf_itUS

    ComfyUI contains multiple vulnerabilities, with the most severe impact being that a remote, unauthenticated attacker could read image-decodable files and probe arbitrary host paths.

07

also known as (1)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

enisa_euvdcisa_csaf_itNVDCVE.orgMITRE
published 2026-07-31modified 2026-10-23
09

references (6)

External citations — patches, advisories, analysis.

scry

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