UpHeron
All vulnerabilities

Servers and applications

CVE-2018-21252

An issue was discovered in Mattermost Server before 5.2, 5.1.1, 5.0.3, and 4.10.3. Attackers could use multiple e-mail addresses to bypass a domain-based policy for signups.

Severity
Medium 4.3
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.10.3, 5.0.3, 5.1.1
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • Version 5.2.0-rc6
  • Version 5.2.0-rc5
  • Version 5.2.0-rc4
  • Version 5.2.0-rc3
All 9 release lines
  • Every version before 4.10.3
  • From 5.0.0 before 5.0.3
  • From 5.1.0 before 5.1.1
  • Version 5.2.0-rc1
  • Version 5.2.0-rc2
  • Version 5.2.0-rc3
  • Version 5.2.0-rc4
  • Version 5.2.0-rc5
  • Version 5.2.0-rc6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-21252
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-21252