CVE-2025-64496 Open WebUI Affected by an External Model Server (Direct Connections) Code Injection via SSE Events
Malicious model servers can inject JavaScript via SSE events in Open WebUI, leading to account takeover and potential backend code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-64496?
CVE-2025-64496 is a high-severity code injection vulnerability in Openwebui Open Webui, published on 8 Nov 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Versions 0.6.224 and prior contain a code injection vulnerability in the Direct Connections feature that allows malicious external model servers to execute arbitrary JavaScript in victim browsers via Server-Sent Event (SSE) execute events. This leads to authentication token theft, complete account takeover, and when chained with the Functions API, enables remote code execution on the backend server. The attack requires the victim to enable Direct Connections (disabled by default) and add the attacker's malicious model URL, achievable through social engineering of the admin and subsequent users. This issue is fixed in version 0.6.35.
Which versions are affected by CVE-2025-64496?
5 open source packages ship an affected version, including open-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
open-webui PyPI | All versions | 0.6.35 |
open-webui PyPI | All versions | 0.6.35 |
open-webui PyPI | All versions | 0.6.35 |
open-webui npm | All versions | 0.6.35 |
open-webui npm | All versions | 0.6.35 |
Products include Openwebui Open Webui.
How do I fix CVE-2025-64496?
Upgrade open-webui to 0.6.35 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-64496 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-64496 exists.
Other vulnerabilities in Openwebui Open Webui
- CVE-2026-44551 Open WebUI: LDAP Empty Password Authentication Bypass
- CVE-2026-56400 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
- CVE-2024-8017 Cross-site Scripting (XSS) in open-webui/open-webui
- CVE-2026-45672 Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
- CVE-2026-87995 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Sources
Also known as GHSA-cm35-v4vp-5xvx, PYSEC-2026-1729.