GHSA-HGRP-FGM8-56G8

Vulnerability from github – Published: 2022-05-24 17:21 – Updated: 2025-10-24 18:39
VLAI?
Summary
Mattermost Server's OAuth 2.0 service is vulnerable to attack through Missing Authorization
Details

An issue was discovered in Mattermost Server before 4.4.3 and 4.3.3. Attackers could reconfigure an OAuth app in some cases where Mattermost is an OAuth 2.0 service provider.

Severity ?
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.4.0-rc1"
            },
            {
              "fixed": "4.4.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2017-18872"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-24T18:39:08Z",
    "nvd_published_at": "2020-06-19T18:15:00Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in Mattermost Server before 4.4.3 and 4.3.3. Attackers could reconfigure an OAuth app in some cases where Mattermost is an OAuth 2.0 service provider.",
  "id": "GHSA-hgrp-fgm8-56g8",
  "modified": "2025-10-24T18:39:08Z",
  "published": "2022-05-24T17:21:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-18872"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mattermost/mattermost/commit/8f6bb1570dd234c63de5241eff9fbb268aad358c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mattermost/mattermost"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    },
    {
      "type": "WEB",
      "url": "http://github.com/mattermost/mattermost/commit/753386c2b2b06233d8bd977e3db29a4fe18098cb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mattermost Server\u0027s OAuth 2.0 service is vulnerable to attack through Missing Authorization"
}


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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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