CVE-2026-45386

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0004
EPSS Percentile 11.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-639
Status published
Products (3)
open-webui/open-webui < 0.9.5
openwebui/open_webui < 0.9.5
pypi/open-webui 0 - 0.9.5PyPI
Published May 15, 2026
Tracked Since May 16, 2026