High severity · published Sep 9, 2026
CVE-2026-87995
Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
8.7
CVSS
0.4%
EPSS
No
On KEV
Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
>= 0.8.11, < 0.11.1 · source: vendor
OW
Open Webui · Openwebui
0.8.11 before 0.11.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87995
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87995
Patch
https://github.com/open-webui/open-webui/commit/54d7a223707f03172efbb9e754db6e69709956d0
Release Notes
https://github.com/open-webui/open-webui/releases/tag/v0.11.1
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj
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