data/osv/GO-2026-5360.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-5360",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2026-27656",
    "GHSA-fg35-5rf6-qg3g"
  ],
  "summary": "Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server",
  "details": "Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server",
  "affected": [
    {
      "package": {
        "name": "github.com/mattermost/mattermost-server",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "10.11.0-rc1+incompatible"
            },
            {
              "fixed": "10.11.12+incompatible"
            },
            {
              "introduced": "11.2.0-rc1+incompatible"
            },
            {
              "fixed": "11.2.4+incompatible"
            },
            {
              "introduced": "11.3.0-rc1+incompatible"
            },
            {
              "fixed": "11.3.2+incompatible"
            },
            {
              "introduced": "11.4.0-rc1+incompatible"
            },
            {
              "fixed": "11.4.1+incompatible"
            }
          ]
        }
      ],
      "ecosystem_specific": {}
    },
    {
      "package": {
        "name": "github.com/mattermost/mattermost-server/v5",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "ecosystem_specific": {}
    },
    {
      "package": {
        "name": "github.com/mattermost/mattermost-server/v6",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "ecosystem_specific": {}
    },
    {
      "package": {
        "name": "github.com/mattermost/mattermost/server/v8",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "8.0.0-20260105080200-d27a2195068d"
            },
            {
              "fixed": "8.0.0-20260217110922-b7d4a1f1f59b"
            }
          ]
        }
      ],
      "ecosystem_specific": {}
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-fg35-5rf6-qg3g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27656"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-5360",
    "review_status": "UNREVIEWED"
  }
}