CVE-2026-45400 Open WebUI: Server-Side Request Forgery (SSRF) bypass in `validate_url`

What is CVE-2026-45400?

CVE-2026-45400 is a high-severity server-side request forgery vulnerability in Openwebui Open Webui, published on 15 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, a parsing difference between the urlparse and requests libraries led to an SSRF bypass vulnerability. This vulnerability is fixed in 0.9.5.

Weakness: CWE-918

Which versions are affected by CVE-2026-45400?

3 open source packages ship an affected version, including open-webui. It affects 1 product.

Products include Openwebui Open Webui.

How do I fix CVE-2026-45400?

Upgrade open-webui to 0.9.5 or later.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-45400 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45400 exists.

Other vulnerabilities in Openwebui Open Webui

• CVE-2026-44551 Open WebUI: LDAP Empty Password Authentication Bypass Critical 9.1
• CVE-2026-56400 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation Critical 9.0
• CVE-2024-8017 Cross-site Scripting (XSS) in open-webui/open-webui Critical 9.0
• CVE-2026-45672 Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed High 8.8
• CVE-2026-87995 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin High 8.7

All Openwebui Open Webui vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8w7q-q5jp-jvgx, PYSEC-2026-2715.