high8.1
CVE-2026-45675
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | open-webui | <= 0.8.12 | 0.9.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openwebui | Open Webui | before 0.9.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-h3ww-q6xx-w7x3
- 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
- https://github.com/open-webui/open-webui/releases/tag/v0.9.0
- https://nvd.nist.gov/vuln/detail/CVE-2026-45675
- https://github.com/pypa/advisory-database/tree/main/vulns/open-webui/PYSEC-2026-2730.yaml