UpHeron
All vulnerabilities

Servers and applications

CVE-2019-20871

An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking.

Severity
High 7.5
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.10.8, 5.7.3, 5.8.1
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • Version 5.9.0-rc4
  • Version 5.9.0-rc3
  • Version 5.9.0-rc2
  • Version 5.9.0-rc1
All 7 release lines
  • Every version before 4.10.8
  • From 5.7.0 before 5.7.3
  • From 5.8.0 before 5.8.1
  • Version 5.9.0-rc1
  • Version 5.9.0-rc2
  • Version 5.9.0-rc3
  • Version 5.9.0-rc4

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-20871
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-20871