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  5. CVE-2017-18878

CVE-2017-18878: Mattermost Server allows users with a session ID to revoke another users' session

May 24, 2022 (updated December 5, 2025)

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. Knowledge of a session ID allows revoking another user’s session.

References

  • github.com/advisories/GHSA-h564-6gc2-fcc6
  • github.com/mattermost/mattermost
  • github.com/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086
  • github.com/mattermost/mattermost/commit/8fbbd688ea2466dd0d70e9c07e9703d78f8a19a5
  • github.com/mattermost/mattermost/commit/affd35071ea155069979fd359726296de8aa6aaf
  • mattermost.com/security-updates
  • nvd.nist.gov/vuln/detail/CVE-2017-18878

Code Behaviors & Features

Detect and mitigate CVE-2017-18878 with GitLab Dependency Scanning

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Affected versions

All versions starting from 4.3.0-rc1 before 4.3.0

Fixed versions

  • 4.3.0

Solution

Upgrade to version 4.3.0 or above.

Impact 4.3 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-284: Improper Access Control
  • CWE-639: Authorization Bypass Through User-Controlled Key
  • CWE-732: Incorrect Permission Assignment for Critical Resource

Source file

go/github.com/mattermost/mattermost-server/CVE-2017-18878.yml

Spotted a mistake? Edit the file on GitLab.

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