Incorrect permission assignment for critical resource in Mattermost Server - CVE-2019-20887
Published: June 19, 2020 / Updated: July 17, 2020
Vulnerability identifier: #VU30238
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-20887
CWE-ID: CWE-732
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote authenticated user to gain access to sensitive information.
An issue was discovered in Mattermost Server before 5.7.1, 5.6.4, 5.5.3, and 4.10.6. It does not honor flags API permissions when deciding whether a user can receive intra-team posts.
Affected software
Mattermost Server
How to mitigate CVE-2019-20887
Install update from vendor's website.
Mattermost Server - update to 5.7.1