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Vulnerability record · CVE-2026-87995 · published 9 September 2026

CVE-2026-87995: Openwebui open webui cross-site scripting vulnerability

Openwebui · Open Webui

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.

8.7 CVSS 3.1 High EPSS 0.42% · top 66.5% CWE-79 · Cross-site scriptingCWE-1021 · Clickjacking
8.7CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
16 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/open-webui/open-webui/commit/54d7a223707f03172efbb9e754db6e69709956d0 Patch
https://github.com/open-webui/open-webui/releases/tag/v0.11.1 Release Notes
https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj ExploitVendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-87995), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.