CVE-2026-45386

Open WebUI: An IDOR vulnerability exists in the pin_channel_message API endpoint

State: Published
Severity: 4.3 Medium
Published: May 15, 2026
Updated: May 19, 2026
Reserved: May 12, 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, Pin/Unpin is a write operation (modifies the message's is_pinned , pinned_by, pinned_at fields), but in standard channels it only checks read permission, allowing users with read-only access to pin/unpin any message. This vulnerability is fixed in 0.9.5.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
open-webuiopen-webui	< 0.9.5Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-5gc6-xhv4-2wg6

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