CVE-2025-13870: mattermost server from 10.5.0 (inclusive), before 10.5.13 (exclusive), from 10.11.0 (inclusive), before 10.11.5…

Affected technology

mattermost server · from 10.5.0 (inclusive), before 10.5.13 (exclusive)
mattermost

mattermost server · from 10.11.0 (inclusive), before 10.11.5 (exclusive)
mattermost

Mattermost · 10.11.0 through 10.11.4, 10.5.0 through 10.5.12
Mattermost

Description’s affected range: versions 10.11.x <= 10.11.4

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

The source says mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to. 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.