UpHeron
All vulnerabilities

Servers and applications

CVE-2023-2808

Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.

Severity
Medium 5.3
Published
29 May 2023
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
7.1.9, 7.8.4, 7.9.3
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost
  • From 5.34.0 before 7.1.9
  • From 7.2.0 before 7.8.4
  • From 7.9.0 before 7.9.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2023-2808
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2023-2808