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  5. CVE-2017-18906

CVE-2017-18906: Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used

May 24, 2022 (updated February 6, 2026)

An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when Single Sign-On OAuth2 is used. An attacker could claim somebody else’s account.

References

  • github.com/advisories/GHSA-fpcr-4rr5-hpcp
  • github.com/mattermost/mattermost
  • github.com/mattermost/mattermost/commit/259ad46f30d0fac2f7c5c14f3b76b2170f7e90c7
  • github.com/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f
  • github.com/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f
  • mattermost.com/security-updates
  • nvd.nist.gov/vuln/detail/CVE-2017-18906

Code Behaviors & Features

Detect and mitigate CVE-2017-18906 with GitLab Dependency Scanning

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Affected versions

All versions starting from 3.10.0 before 3.10.2

Fixed versions

  • 3.10.2

Solution

Upgrade to version 3.10.2 or above.

Impact 8.1 HIGH

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

Learn more about CVSS

Weakness

  • CWE-613: Insufficient Session Expiration

Source file

go/github.com/mattermost/mattermost-server/CVE-2017-18906.yml

Spotted a mistake? Edit the file on GitLab.

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