CVE-2025-9079: mattermost server from 9.11.0 (inclusive), before 9.11.18 (exclusive), from 10.5.0 (inclusive), before 10.5.9…

Affected technology

mattermost server · from 9.11.0 (inclusive), before 9.11.18 (exclusive)
mattermost

mattermost server · from 10.5.0 (inclusive), before 10.5.9 (exclusive)
mattermost

mattermost server · from 10.8.0 (inclusive), before 10.8.4 (exclusive)
mattermost

mattermost server · from 10.9.0 (inclusive), before 10.9.4 (exclusive)
mattermost

mattermost server · from 10.10.0 (inclusive), before 10.10.2 (exclusive)
mattermost

Mattermost · 10.8.0 through 10.8.3, 10.5.0 through 10.5.8, 9.11.0 through 9.11.17, 10.10.0 through 10.10.1, 10.9.0 through 10.9.3
Mattermost

Description’s affected range: versions 10.8.x <= 10.8.3

Component: Not specified by the source

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

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

What an attacker can do

Admin users can execute arbitrary code via malicious plugin upload to prepackaged plugins directory. Vendor/CNA’s CVSS 3.1 assessment (base score 8.0/10) rates confidentiality, integrity and availability impact as high. NVD’s CVSS 3.1 assessment (base score 7.2/10) rates confidentiality, integrity and availability impact as high.