Improper Input Validation Affecting github.com/mattermost/mattermost-server/app package, versions >=5.34.0 <7.1.9>=7.8.0 <7.8.4>=7.9.0 <7.9.3


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.05% (24th percentile)

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  • Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERAPP-5660382
  • published29 May 2023
  • disclosed29 May 2023
  • creditxp

Introduced: 29 May 2023

CVE-2023-2808  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade github.com/mattermost/mattermost-server/app to version 7.1.9, 7.8.4, 7.9.3 or higher.

Overview

github.com/mattermost/mattermost-server/app is an open source Slack-alternative in Golang and React.

Affected versions of this package are vulnerable to Improper Input Validation due to failing to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink. This allows an attacker to trigger link preview on a disallowed domain using a specially crafted link.

CVSS Scores

version 3.1