CVE-2025-9081: mattermost server from 9.11.0 (inclusive), before 9.11.17 (exclusive), from 10.5.0 (inclusive), before 10.5.9…

Affected technology

mattermost server · from 9.11.0 (inclusive), before 9.11.17 (exclusive)
mattermost

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

Mattermost · 10.5.0 through 10.5.8, 9.11.0 through 9.11.17
Mattermost

Description’s affected range: versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls 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

Any authenticated user can download sensitive files via board file download endpoint using UUID enumeration. 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 6.5/10) rates confidentiality impact as high; integrity and availability impact as none.