CVE-2026-59215 Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_id binding
Authenticated users can disclose private channel messages by referencing thread parents from other channels due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-59215?
CVE-2026-59215 is a low-severity missing authorization vulnerability in Openwebui Open Webui, published on 9 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, channel thread parent and reply handling did not bind parent_id to the channel in the URL, allowing an authenticated user to reference a message from another private or DM channel and disclose thread context across channels. This issue is fixed in version 0.10.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-59215?
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-2026-59215?
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-2026-59215 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59215 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-73x5-h92w-xc2j, PYSEC-2026-3591.