CVE-2026-6592Public exploitNetwork attack vector

Stored XSS via unsafe userdata content type

Published Apr 20, 2026 · Updated Apr 20, 2026

Stored cross-site scripting in ComfyUI 0.1 through 0.13.0 allows remote authenticated users to execute script in another user's browser. The getuserdata handler in app/user_manager.py returns attacker-supplied userdata with a browser-executable content type instead of forcing a safe download. The server must be reachable beyond its default localhost binding, and a victim must open the crafted userdata URL; resulting same-origin script can modify data accessible through the interface.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in ComfyUI 0.1 through 0.13.0 allows remote authenticated users to execute script in another user's browser. The getuserdata handler in app/user_manager.py returns attacker-supplied userdata with a browser-executable content type instead of forcing a safe download. The server must be reachable beyond its default localhost binding, and a victim must open the crafted userdata URL; resulting same-origin script can modify data accessible through the interface.

The record

CVE
CVE-2026-6592
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
Comfy Org
Product
ComfyUI
Classifications
CWE-79, CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1
  2. Affected versionversion=0.10
  3. Affected versionversion=0.11
  4. Affected versionversion=0.12
  5. Affected versionversion=0.13.0
  6. Affected versionversion=0.2
  7. Affected versionversion=0.3
  8. Affected versionversion=0.4
  9. Affected versionversion=0.5
  10. Affected versionversion=0.6
  11. Affected versionversion=0.7
  12. Affected versionversion=0.8
  13. Affected versionversion=0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Comfy Org · ComfyUIversion=0.1; version=0.10; version=0.11; version=0.12; version=0.13.0; version=0.2; version=0.3; version=0.4; version=0.5; version=0.6; version=0.7; version=0.8; version=0.9

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:UR
3.5VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
5.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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