UpHeron
All vulnerabilities

Servers and applications

CVE-2018-21259

An issue was discovered in Mattermost Server before 4.10.1, 4.9.4, and 4.8.2. It allows attackers to cause a denial of service (application hang) via a malformed link in a channel.

Severity
Medium 5.3
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.8.2, 4.9.4, 4.10.1
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • Every version before 4.8.2
  • From 4.9.0 before 4.9.4
  • From 4.10.0 before 4.10.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-21259
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-21259