PT-2020-8898 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2020-06-30 · CVE-2018-21255

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Mattermost Server versions prior to 5.1

Description An issue was discovered where non-members of a channel could use the "Channel PATCH API" to modify that channel.

Recommendations For versions prior to 5.1, update to version 5.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the Channel PATCH API endpoint until a patch is available.

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2018-21255

Affected Products

Mattermost Server

References · 4

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-21255 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-21255 · Security Note
• https://t.me/cibsecurity/12896 · Telegram Post