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  5. CVE-2017-18915

CVE-2017-18915: Mattermost Server server restarts may provide attackers with API access

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. After a restart of a server, an attacker might suddenly gain API Endpoint access.

References

  • github.com/advisories/GHSA-hxxj-8phw-74vw
  • github.com/mattermost/mattermost
  • github.com/mattermost/mattermost/commit/0968e4079e0aa670254f3fe3a7248d126e3cf877
  • github.com/mattermost/mattermost/commit/c7bdce8a6641ed8d361a43b6004a351535c78423
  • github.com/mattermost/mattermost/commit/fb325cc339eb8d8efb60dbadc48fd38897201c6f
  • mattermost.com/security-updates
  • nvd.nist.gov/vuln/detail/CVE-2017-18915

Code Behaviors & Features

Detect and mitigate CVE-2017-18915 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 starting from 3.7.0 before 3.7.5, all versions starting from 3.8.0 before 3.8.2

Fixed versions

  • 3.7.5
  • 3.8.2

Solution

Upgrade to versions 3.7.5, 3.8.2 or above.

Impact 9.8 CRITICAL

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

Learn more about CVSS

Weakness

  • CWE-20: Improper Input Validation
  • CWE-807: Reliance on Untrusted Inputs in a Security Decision

Source file

go/github.com/mattermost/mattermost-server/CVE-2017-18915.yml

Spotted a mistake? Edit the file on GitLab.

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