CVE-2026-45386

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

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.

Affected

open-webui

CVSS v3.1 GITHUB

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

0.29% chance of exploitation in the next 30 days, 20th percentile

Published

2026-05-15

Updated

2026-05-19

Proof-of-concept exploits (1)

• advisories/GHSA-5gc6-xhv4-2wg6

Security advisories

• open-webui/open-webui/security/advisories/GHSA-5gc6-xhv4-2wg6

References

• CVE Record
• NVD entry