GHSA-9589-MQ83-F749

Vulnerability from github – Published: 2022-05-24 17:21 – Updated: 2026-01-12 19:29
VLAI?
Summary
Mattermost Server is vulnerable to DoS through maliciously crafted posts
Details

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.

Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0-rc1"
            },
            {
              "fixed": "4.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2017-18898"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-404"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-12T19:29:16Z",
    "nvd_published_at": "2020-06-19T19:15:00Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-9589-mq83-f749",
  "modified": "2026-01-12T19:29:16Z",
  "published": "2022-05-24T17:21:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-18898"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grundleborg/mattermost/commit/5286318c72aa230f33f89df3b4cbdc33a0822a93"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mattermost/mattermost/commit/5bf6f06c02c368b9c73a8be2d2d8795b3405b22b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mattermost/mattermost/commit/5c22176c963a7393241872073547f30083efe218"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mattermost/mattermost"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mattermost Server is vulnerable to DoS through maliciously crafted posts"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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