GHSA-3xpf-xq7r-v8c5: open-webui (CVE-2026-70486)

Package	Ecosystem	Affected	Fixed in
open-webui	PyPI	>=0.9.0, <0.11.0	0.11.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Open WebUI versions 0.9.0 up to but not including 0.11.0 are affected. An authenticated user with access to a terminal server configured by an admin can get a previewed HTML file to run script in the Open WebUI origin, which lets them read the victim's session token and take over the account. The victim only needs to have the chat open, and the attacker must still get the malicious file written and displayed. Upgrade to Open WebUI 0.11.0 or later, where the preview no longer grants same-origin access by default.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0038, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:40 UTC First seen by agentprime
31 Oct 2026, 14:40 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.