SB2026050629 - Missing Authorization in Open WebUI

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Main Vulnerability Database SB2026050629

SB2026050629 - Missing Authorization in Open WebUI

Published: May 6, 2026

Security Bulletin ID SB2026050629
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Missing Authorization (CVE-ID: N/A)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to modify other users' messages.

The vulnerability exists due to improper authorization in the POST /api/v1/channels/{channel_id}/messages/{message_id}/update endpoint when handling update requests for messages in standard channels. A remote user can send a specially crafted update request to modify other users' messages.

Exploitation requires a standard channel whose channel.type is neither group nor dm, with access_control set to None or otherwise allowing read access, and knowledge of the target message_id.


Remediation

Install update from vendor's website.

References