Report · CERT/CCAbout CVE-2026-123790Published 12 Nov 2026

VU#944667: ComfyUI-Easy-Use contains unauthenticated path traversal vulnerability

Source CERT/CC

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Authoritative record:CVE-2026-123790· High

Not known to be exploited.

Data as of 12 Nov 2026, 15:04 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation evidence

Disclosed: evidence found.
CVE published 12 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
ComfyUI-Easy-UseComfyUI-Easy-Use	Affected >=1.3.6 <=1.3.6	Fixed in–

AI-suggested

To mitigate this vulnerability, users should remove the ComfyUI-Easy-Use extension or restrict network access to the ComfyUI instance to trusted users only, preventing unauthenticated access to the vulnerable routes.

Description

ComfyUI-Easy-Use version 1.3.6 contains an unauthenticated path traversal vulnerability in its save_preview() handler. This flaw allows an attacker who can access the affected ComfyUI instance over the network to overwrite a custom node's Python file. Upon restarting ComfyUI, the attacker-supplied code is executed with the privileges of the ComfyUI process. Exploitation requires no user interaction but does require network access to the vulnerable routes without authentication. The vulnerability was confirmed by the reporter, but no vendor patch or statement is currently available.

Impact

An unauthenticated remote attacker can execute arbitrary Python code and operating system commands with the privileges of the ComfyUI process. This allows reading or modifying models, workflows, and other files accessible to the process, as well as obtaining credentials available in the environment. Exploitation requires no user interaction and can lead to full compromise of the affected system running ComfyUI with the vulnerable extension.

Summary

The vulnerability in ComfyUI-Easy-Use 1.3.6 resides in the save_preview() handler, which permits an unauthenticated attacker to perform a path traversal attack to overwrite an installed custom node's __init__.py file. The attacker first uploads a malicious Python file to the input directory, then uses the vulnerable handler to replace the legitimate node file. When ComfyUI restarts, it imports and executes the malicious code, enabling arbitrary code execution with the privileges of the ComfyUI process. This attack requires that the ComfyUI instance exposes the affected routes to unauthenticated users over the network.

References

kb.cert.org/vuls/id/944667 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Nov 2026, 15:04 UTC

Technical details

References

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