Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity missing authorization in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 79.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.8.6	GHSA-jgj3-r8hr-9pjw
PyPI	open-webui	0.8.6	PYSEC-2026-2739

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.8.6

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-jgj3-r8hr-9pjw x_refsource_CONFIRM