CVE-2026-9824CWE-862

Remote cluster metadata enumeration via /share-channel autocomplete

Medium · published July 13, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
18.2
In the wild
Unconfirmed
What it is

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676

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:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00270 · 18.2th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-07-13T10:47Z
EPSS history
Timeline
  • 13 JUL 10:47Z
    Remote cluster metadata enumeration via /share-channel autocomplete
    cvelistv5