High 8.2Published Aug 4, 2026

CVE-2026-70486Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin

Updated under an hour ago (2026-10-19 08:50 UTC)

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It affects open-webui and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for open-webui

Exploited in the last 30 days

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from localStorage, and take over the account, with possible server-side code execution if the victim was an admin or held workspace.functions. This issue is fixed in 0.11.0.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness (CWE): CWE-79, CWE-1021
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-webui open-webui open_webui:open_webui (from the name)	from 0.9.0, < 0.11.0	CNA record
openwebui open_webui openwebui:open_webui	from 0.9.0 before 0.11.0	NVD

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5x-refsource-confirm, exploit, patch, vendor-advisory
https://github.com/open-webui/open-webui/pull/26907x-refsource-misc, patch, vendor-advisory
https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543cx-refsource-misc, patch
https://github.com/open-webui/open-webui/releases/tag/v0.11.0x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.