CVE-2026-123364

What it is

OctoPrint provides a web interface for controlling consumer 3D printers. From 2.0.0rc1 until 2.0.0rc7, an authenticated user can supply a crafted default port or baudrate through a connect request to the bundled Serial Connector plugin. OctoPrint persists these values in printerConnection.preferred.parameters.port or printerConnection.preferred.parameters.baudrate and renders them as HTML when another user views the saved connection parameters, allowing script execution in that user's browser and actions within the user's OctoPrint access. This issue is fixed in version 2.0.0rc7.

At a glance

Exploitability

Can be exploited from the same network segment with a low-privilege account, but needs a user to act. Limited direct impact.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-11-09 17:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-09 17:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: not scored yet.
• Severity: 2.4 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-11-09 17:17 UTC

Last modified

2026-11-09 17:17 UTC

Weakness

CWE-79 · Cross-site scripting

Record status

Deferred

Attack profile CVSS 4.0 · 2.4

Attack vector

Adjacent network

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

Passive

Confidentiality

Low

Integrity

Low

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-123364.md and follow it. Check whether this project is affected by CVE-2026-123364. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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