CVE-2025-11777: mattermost server from 10.5.0 (inclusive), before 10.5.12 (exclusive), from 10.11.0 (inclusive), before 10.11.4…

Affected technology

mattermost server · from 10.5.0 (inclusive), before 10.5.12 (exclusive)
mattermost

mattermost server · from 10.11.0 (inclusive), before 10.11.4 (exclusive)
mattermost

Mattermost · 10.11.0 through 10.11.3, 10.5.0 through 10.5.11
Mattermost

Description’s affected range: versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

Vendor/CNA’s CVSS 3.1 assessment (base score 3.1/10) rates confidentiality impact as low; integrity and availability impact as none. NVD’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality impact as low; integrity and availability impact as none. The description does not specify what an attacker can achieve beyond these rated impacts.