# CVE-2026-123790: Unauthenticated Path Traversal in ComfyUI-Easy-Use Allows Remote Code Execution

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

ComfyUI-Easy-Use version 1.3.6 contains a path traversal vulnerability in the `save_preview()` handler for POST `/easyuse/save/{name}`. The handler checks the source directory before appending a user-supplied filename and allows the request to select the `custom_nodes` directory as a copy destination. An unauthenticated attacker who can reach the ComfyUI server can overwrite an installed custom node’s Python entry point with an uploaded file. When ComfyUI restarts and loads the modified node, the attacker’s code runs with the privileges of the ComfyUI process.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- ComfyUI-Easy-Use / ComfyUI-Easy-Use: ≥ 1.3.6; ≤ 1.4.1 (affected, custom). Source: CNA: certcc

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-22

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/yolain/ComfyUI-Easy-Use (CNA: certcc)

- https://blog.nhhoang.io.vn/posts/2026/11/cve-2026-123790-comfyui-easy-use-save-preview-rce/ (CNA: certcc)

- https://github.com/yolain/ComfyUI-Easy-Use/commit/8a0f2fc412c1c6f9109e9392064800a87a706775 (CNA: certcc)

## Provenance

- CNA: certcc: https://www.cve.org/CVERecord?id=CVE-2026-123790; retrieved 2026-11-12; source updated 2026-11-12

Revision: ed1c8baea9dcfc1e037b87989743b5a760daba811d3f265c0992b91a9d2ed120

Canonical: https://y2.dev/cve/CVE-2026-123790

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