CVE-2026-8823CWE-863

User Manager can demote bot accounts to guest without bot-management permission

Low · published June 22, 2026

CVSS v3.1
3.8
EPSS
0%
Percentile
23.5
In the wild
Unconfirmed
What it is

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669

The record
Technical detail
CVSS v3.1
3.8 · LOW
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00318 · 23.5th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-06-22T13:41Z
EPSS history
Timeline
  • 22 JUN 13:41Z
    User Manager can demote bot accounts to guest without bot-management permission
    cvelistv5