Open WebUI AI Platform Vulnerability in User Conversation Handling
CVE-2026-45349

7.1HIGH

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
15 May 2026

What is CVE-2026-45349?

Open WebUI, a self-hosted platform designed for offline artificial intelligence operations, is vulnerable due to an improper access control issue. Users could exploit an API endpoint to access and continue conversations of other users by using their own API keys and the Chat ID of those users before the issue was resolved in version 0.9.0. This flaw raises significant privacy and security concerns, emphasizing the need for robust access controls in user interaction functionalities.

Affected Version(s)

open-webui < 0.9.0

References

https://github.com/open-webui/open-webui/security/advisor...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.