Information disclosure in Mattermost Server - CVE-2019-20855

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Main Vulnerability Database Vulnerabilities #VU30247

Information disclosure in Mattermost Server - CVE-2019-20855

Published: June 19, 2020 / Updated: July 17, 2020


Vulnerability identifier: #VU30247
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-20855
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Mattermost, Inc.
Affected software:
Mattermost Server

Detailed vulnerability description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

An issue was discovered in Mattermost Server before 5.16.1, 5.15.2, 5.14.5, and 5.9.6. It allows attackers to obtain sensitive information (local files) during legacy attachment migration.


How to mitigate CVE-2019-20855

Install update from vendor's website.

Sources