Improper Neutralization of Alternate XSS Syntax in Open WebUI - #VU130937
Published: May 11, 2026
Vulnerability identifier: #VU130937
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-87
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open WebUI
Affected software:
Open WebUI
Open WebUI
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript in the application's origin.
The vulnerability exists due to improper neutralization of alternate xss syntax in the profile image endpoint when processing webhook profile_image_url values containing svg data URLs. A remote user can supply a specially crafted svg payload in a webhook profile image to execute arbitrary JavaScript in the application's origin.
The Channels feature must be enabled, and user interaction is required because the malicious profile-image URL must be opened in a browser.
Remediation
Install security update from vendor's website.