CVE-2026-45386CWE-639

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

Medium · published May 15, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
20.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00286 · 20.0th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-05-15T20:36Z
EPSS history
Timeline
  • 15 MAY 20:36Z
    Open WebUI: An IDOR vulnerability exists in the pin_channel_message API endpoint
    cvelistv5