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7.5

An issue was discovered in Mattermost Server before 5.4.0. It mishandles possession of superfluous authentication credentials.

CVE-2018-21248 · published 6 years ago
Summary

An issue was discovered in Mattermost Server before 5.4.0. It mishandles possession of superfluous authentication credentials.

What to do
  • Update mattermost mattermost_server to version 5.4.0 or later.
Affected software
VendorProductAffected versions
mattermost mattermost_server < 5.4.0
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Original advisory text
An issue was discovered in Mattermost Server before 5.4.0. It mishandles possession of superfluous authentication credentials.
An issue was discovered in Mattermost Server before 5.4.0. It mishandles possession of superfluous authentication credentials.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.5 High
Exploitation
1% chance of attack within 30 days
Type
CWE-522Insufficiently Protected Credentials
Timeline
Published19 Jun 2020
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2018-21248 · NVD
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