Advisory Database
  • Advisories
  • Dependency Scanning
  1. golang
  2. ›
  3. github.com/mattermost/mattermost-server
  4. ›
  5. CVE-2017-18911

CVE-2017-18911: Mattermost Server has X.509 Improper Certificate Validation

May 24, 2022 (updated February 6, 2026)

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The X.509 certificate validation can be skipped for a TLS-based e-mail server.

References

  • github.com/advisories/GHSA-m462-mqw4-2c8m
  • github.com/mattermost/mattermost
  • github.com/mattermost/mattermost/commit/222bce0c5c1abb2f58c3a6de1fe8c5d3accffb21
  • github.com/mattermost/mattermost/commit/691c18157025d4808b5b11de1d6de01050e54fa6
  • github.com/mattermost/mattermost/commit/e9bb8cdfb4915067349a4840ab15ff941c4eb070
  • mattermost.com/security-updates
  • nvd.nist.gov/vuln/detail/CVE-2017-18911

Code Behaviors & Features

Detect and mitigate CVE-2017-18911 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions before 3.6.7-rc1, all versions starting from 3.7.0 before 3.7.5, all versions starting from 3.8.0 before 3.8.2

Fixed versions

  • 3.6.7-rc1
  • 3.7.5
  • 3.8.2

Solution

Upgrade to versions 3.6.7-rc1, 3.7.5, 3.8.2 or above.

Impact 9.1 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-295: Improper Certificate Validation

Source file

go/github.com/mattermost/mattermost-server/CVE-2017-18911.yml

Spotted a mistake? Edit the file on GitLab.

  • Site Repo
  • About GitLab
  • Terms
  • Privacy Statement
  • Contact

Page generated Sat, 07 Feb 2026 12:18:14 +0000.