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CVE-2024-39836

Status: AnalyzedMedium (6.5)—

Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.

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

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2024-39836",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-39836",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-08-22T16:39:11.770507Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "responsibledisclosure@mattermost.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 2.2
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "responsibledisclosure@mattermost.com",
      "affectedData": [
        {
          "vendor": "Mattermost",
          "product": "Mattermost",
          "versions": [
            {
              "status": "affected",
              "version": "9.9.0",
              "versionType": "semver",
              "lessThanOrEqual": "9.9.1"
            },
            {
              "status": "affected",
              "version": "9.5.0",
              "versionType": "semver",
              "lessThanOrEqual": "9.5.7"
            },
            {
              "status": "affected",
              "version": "9.10.0"
            },
            {
              "status": "affected",
              "version": "9.8.0",
              "versionType": "semver",
              "lessThanOrEqual": "9.8.2"
            },
            {
              "status": "unaffected",
              "version": "9.11.0"
            },
            {
              "status": "unaffected",
              "version": "9.9.2"
            },
            {
              "status": "unaffected",
              "version": "9.5.8"
            },
            {
              "status": "unaffected",
              "version": "9.10.1"
            },
            {
              "status": "unaffected",
              "version": "9.8.3"
            }
          ],
          "defaultStatus": "unaffected"
        }
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  ],
  "published": "2024-08-22T07:15:03.960",
  "references": [
    {
      "url": "https://mattermost.com/security-updates",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "responsibledisclosure@mattermost.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "responsibledisclosure@mattermost.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to  ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails."
    },
    {
      "lang": "es",
      "value": "Las versiones de Mattermost 9.9.x &lt;= 9.9.1, 9.5.x &lt;= 9.5.7, 9.10.x &lt;= 9.10.0 y 9.8.x &lt;= 9.8.2 no garantizan que los usuarios remotos/sintéticos no puedan crear sesiones ni restablecer contraseñas, que permite que las direcciones de correo electrónico eliminadas, creadas por canales compartidos, se utilicen para recibir notificaciones por correo electrónico y restablecer contraseñas, cuando sean correos electrónicos válidos y funcionales."
    }
  ],
  "lastModified": "2026-06-17T07:42:53.517",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "7FEEA8D7-745A-49FF-8B01-CA0D1D820D48",
              "versionEndExcluding": "9.5.8",
              "versionStartIncluding": "9.5.0"
            },
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              "vulnerable": true,
              "matchCriteriaId": "9B9B4EAB-A618-4823-BECD-0BFD3D76A9D2",
              "versionEndExcluding": "9.8.3",
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            },
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              "matchCriteriaId": "A445A478-E185-49DF-8CDC-F42BBF8577D4",
              "versionEndExcluding": "9.9.2",
              "versionStartIncluding": "9.9.0"
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0CA40F21-914D-4891-A578-02E6F35FE249",
              "versionEndExcluding": "9.10.1",
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            }
          ],
          "operator": "OR"
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  ],
  "sourceIdentifier": "responsibledisclosure@mattermost.com"
}