CVE-2026-59216 Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id
Authenticated users can execute Python code or tools in other users' sessions by exploiting unvalidated Socket.IO session IDs, leading to cross-user 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-2026-59216?
CVE-2026-59216 is a high-severity missing authorization vulnerability in Openwebui Open Webui, published on 9 Jul 2026. 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 an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, get_event_call delivered execute:python and execute:tool Socket.IO events to a client-supplied session_id after checking only that the session was connected, allowing authenticated users who learned another socket ID through ydoc:document:join to run code interpreter Python or tools in that user session. This issue is fixed in version 0.10.0.
Which versions are affected by CVE-2026-59216?
3 open source packages ship an affected version, including open-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
open-webui PyPI | All versions | 0.10.0 |
open-webui PyPI | All versions | 0.10.0 |
open-webui PyPI | All versions | 0.10.0 |
Products include Openwebui Open Webui.
How do I fix CVE-2026-59216?
Upgrade open-webui to 0.10.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-59216 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59216 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-74h3-cxq7-vc5q, PYSEC-2026-3592.