CVE-2026-44571 - Open WebUI: Improper Authorization in Standard Channels Allows Message Updates with Read Permission

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MEDIUM

Open WebUI: Improper Authorization in Standard Channels Allows Message Updates with Read Permission

Published May 15, 2026

6.5

MEDIUM

CVSS 3.1

EPSS 0.34%

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.6, in standard channels (i.e., channels whose channel.type is neither group nor dm), the endpoint POST /api/v1/channels/{channel_id}/messages/{message_id}/update can be accessed with read permission only. When access_control is set to None, the authorization check has_access(..., type="read") evaluates to True, allowing users who are not the message owner to update messages. As a result, unauthorized modification of other users’ messages is possible. This vulnerability is fixed in 0.8.6.

Affected products

Vendor Open-Webui Product Open-Webui Default
n/a
- Version
  < 0.8.6
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Open-Webui

n/a

Version	Status	Constraints
< 0.8.6	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-862

Missing Authorization

References (3)

https://github.com/advisories/GHSA-jgj3-r8hr-9pjw
Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-jgj3-r8hr-9pjw
exploitx_refsource_CONFIRMMitigationVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44571

Link	Providers	Tags
https://github.com/advisories/GHSA-jgj3-r8hr-9pjw		Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-jgj3-r8hr-9pjw		exploitx_refsource_CONFIRMMitigationVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44571