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  5. CVE-2017-18898

CVE-2017-18898: Mattermost Server is vulnerable to DoS through maliciously crafted posts

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 crafted posts that potentially cause a web browser to hang.

References

  • github.com/advisories/GHSA-9589-mq83-f749
  • github.com/grundleborg/mattermost/commit/5286318c72aa230f33f89df3b4cbdc33a0822a93
  • github.com/mattermost/mattermost
  • github.com/mattermost/mattermost/commit/5bf6f06c02c368b9c73a8be2d2d8795b3405b22b
  • github.com/mattermost/mattermost/commit/5c22176c963a7393241872073547f30083efe218
  • mattermost.com/security-updates
  • nvd.nist.gov/vuln/detail/CVE-2017-18898

Code Behaviors & Features

Detect and mitigate CVE-2017-18898 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 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:N/I:N/A:L

Learn more about CVSS

Weakness

  • CWE-404: Improper Resource Shutdown or Release

Source file

go/github.com/mattermost/mattermost-server/CVE-2017-18898.yml

Spotted a mistake? Edit the file on GitLab.

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