Cross-User Confidentiality Issue in Open WebUI by Open WebUI
CVE-2026-70487

5.3MEDIUM

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
4 August 2026

What is CVE-2026-70487?

Open WebUI is a self-hosted AI platform that permits users to perform operations with model metadata. However, versions 0.8.8 to 0.11.0 contain a vulnerability that allows authenticated users to access knowledge attachments without proper access control. Specifically, if a user is aware of another user's file ID, they could exploit the built-in knowledge tools to retrieve sensitive information from that file. This loophole compromises user privacy and allows unauthorized reading of information across users, while not affecting the overall permissions set on the knowledge base or the validation of saved workspace models. The issue has been resolved in version 0.11.0.

Affected Version(s)

open-webui >= 0.8.8, < 0.11.0

References

https://github.com/open-webui/open-webui/security/advisor...
x_refsource_CONFIRM
https://github.com/open-webui/open-webui/commit/305880f2e...
x_refsource_MISC
https://github.com/open-webui/open-webui/releases/tag/v0....
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.