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  5. CVE-2017-18895

CVE-2017-18895: Mattermost Server exposes sensitive user status information via REST API version 4 endpoint

May 24, 2022 (updated January 12, 2026)

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows attackers to obtain sensitive information (user statuses) via a REST API version 4 endpoint.

References

  • github.com/advisories/GHSA-h742-xx59-r9pq
  • github.com/mattermost/mattermost
  • github.com/mattermost/mattermost/commit/3c34e2b2dcb0fde96a10e68d877aa7d0ab511669
  • github.com/mattermost/mattermost/commit/722fb1947a2e7395ccf16adce9206736d803a9f3
  • github.com/mattermost/mattermost/commit/d38328976e2c8bb0fab91e656042a0d8ac37bc76
  • mattermost.com/security-updates
  • nvd.nist.gov/vuln/detail/CVE-2017-18895

Code Behaviors & Features

Detect and mitigate CVE-2017-18895 with GitLab Dependency Scanning

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Affected versions

All versions before 4.0.5, all versions starting from 4.1.0 before 4.1.1, all versions starting from 4.2.0-rc1 before 4.2.0

Fixed versions

  • 4.0.5
  • 4.1.1
  • 4.2.0

Solution

Upgrade to versions 4.0.5, 4.1.1, 4.2.0 or above.

Impact 5.3 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Source file

go/github.com/mattermost/mattermost-server/CVE-2017-18895.yml

Spotted a mistake? Edit the file on GitLab.

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