What is CVE-2026-56670?

CVE-2026-56670 is a high-severity vulnerability in Comfy-Org Comfyui, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-07-31.

How severe is CVE-2026-56670?

High severity. CVSS v3 base score is 8.2 out of 10.

XSS in Comfy-Org Comfyui

CVE-2026-56670

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (13.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.

Affected products

Comfy-org Comfyui — versions < 0.28.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-56670?: CVE-2026-56670 is a high-severity vulnerability in Comfy-Org Comfyui, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-07-31.
How severe is CVE-2026-56670?: High severity. CVSS v3 base score is 8.2 out of 10.