CVE-2026-27769CWE-862

Connected Workspaces: Malicious remote server can manipulate arbitrary user's status

Low · published April 15, 2026

CVSS v3.1
2.7
EPSS
0%
Percentile
17.9
In the wild
Unconfirmed
What it is

Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603

The record
Technical detail
CVSS v3.1
2.7 · LOW
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00267 · 17.9th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-04-15T10:11Z
EPSS history
Timeline
  • 15 APR 10:11Z
    Connected Workspaces: Malicious remote server can manipulate arbitrary user's status
    cvelistv5