Cross-site scripting in Open WebUI - CVE-2026-45665
Published: May 12, 2026
Vulnerability identifier: #VU131115
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-45665
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in a victim's browser and disclose sensitive information.
The vulnerability exists due to cross-site scripting in the Banner component in src/lib/components/common/Banner.svelte when rendering stored banner content after sanitizing input before parsing it with marked. A remote privileged user can store a specially crafted banner payload to execute arbitrary script in a victim's browser and disclose sensitive information.
User interaction is required, and the malicious banner is rendered for other users including the primary administrator.
Affected software
Open WebUI
How to mitigate CVE-2026-45665
Install security update from vendor's website.
Open WebUI - update to 0.8.0