Cross-site scripting in Open WebUI - CVE-2026-87995
Published: September 28, 2026
Vulnerability identifier: #VU152697
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-87995
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to take over victim accounts.
The vulnerability exists due to cross-site scripting in the terminal port-preview iframe in src/lib/components/chat/FileNav/PortPreview.svelte when rendering content from a previewed terminal port. A remote user can serve a crafted page on a shared terminal server to take over victim accounts.
User interaction is required for the victim to open the attacker's port preview. Exploitation requires an administrator-configured terminal server reachable by both parties.
Affected software
Open WebUI
How to mitigate CVE-2026-87995
Install security update from vendor's website.
Open WebUI - update to 0.11.1