Incorrect permission assignment for critical resource in Mattermost Server - CVE-2017-18876
Published: June 19, 2020 / Updated: July 17, 2020
Vulnerability identifier: #VU30223
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-18876
CWE-ID: CWE-732
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote privileged user to gain access to sensitive information.
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used. A System Admin can test for the existence of an arbitrary file.
Affected software
Mattermost Server
How to mitigate CVE-2017-18876
Install update from vendor's website.
Mattermost Server - update to 4.2.1