GHSA-h3ww-q6xx-w7x3: open-webui (CVE-2026-45675)

Package	Ecosystem	Affected	Fixed in
open-webui	PyPI	<0.9.0	0.9.0

Machine-written summary

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

Open WebUI versions before 0.9.0 are vulnerable to a race condition in the LDAP and OAuth login flows, where several users logging in concurrently on a fresh instance with no existing users can all be granted the admin role. An attacker would need to have LDAP or OAuth enabled and make an authentication attempt at the same moment as the legitimate first admin, after which they gain full administrator access. Upgrade to Open WebUI 0.9.0 or later, where the fix is included.

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
8.1	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0035, the 29th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

15 May 2026, 20:16 UTC Confirmed by NVD
31 Oct 2026, 14:42 UTC First seen by agentprime
31 Oct 2026, 14:42 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.