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CVE-2019-20843

Status: ModifiedHigh (7.5)—

An issue was discovered in Mattermost Server before 5.18.0, 5.17.2, 5.16.4, 5.15.4, and 5.9.7. There are weak permissions for configuration files.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Mattermost — Mattermost Server

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2019-20843",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-06-19T14:15:10.433",
  "references": [
    {
      "url": "https://mattermost.com/security-updates/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://mattermost.com/security-updates/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-281"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Mattermost Server before 5.18.0, 5.17.2, 5.16.4, 5.15.4, and 5.9.7. There are weak permissions for configuration files."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Mattermost Server versiones anteriores a 5.18.0, 5.17.2, 5.16.4, 5.15.4 y 5.9.7. Se presentan permisos débiles para los archivos de configuración"
    }
  ],
  "lastModified": "2026-06-17T02:31:18.180",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4A5BE0A1-194D-4E16-8547-2290F3BF777D",
              "versionEndExcluding": "5.9.7"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "87675506-EA42-48F1-B12B-C137D58A31BC",
              "versionEndExcluding": "5.15.4",
              "versionStartIncluding": "5.15.0"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "88A5E809-55F9-4B8C-8CC9-D2263632626E",
              "versionEndExcluding": "5.16.4",
              "versionStartIncluding": "5.16.0"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1861A510-327D-452B-A4FA-12204ECA2358",
              "versionEndExcluding": "5.17.2",
              "versionStartIncluding": "5.17.0"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:5.18.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5966FFD8-6763-48E0-85A3-6624241F6FAB"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:5.18.0:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "51C15C53-6CCF-4A49-AAF2-88AE72E2216F"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:5.18.0:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F46E3522-C7EB-4139-84F5-AFCED85D3C19"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:5.18.0:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7A353365-71E8-4382-9212-BD4495F5CF7E"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}