Cross-site scripting in OctoPrint - CVE-2026-123364
Published: November 9, 2026
Vulnerability identifier: #VU162910
CSH Severity: Low
CVSS v4: 2.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-123364
CWE-ID: CWE-79
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged adjacent-network attacker to execute JavaScript in another user's browser through stored cross-site scripting.
The vulnerability exists due to improper neutralization of saved port or baudrate defaults in OctoPrint's bundled Serial Connector plugin when supplied through an API connection request. A low-privileged adjacent-network attacker can submit crafted connection defaults that execute when a victim views the affected interface.
Affected software
OctoPrint
How to mitigate CVE-2026-123364
Install security update from vendor's website.
OctoPrint - update to 2.0.0