ncsc-2025-0378
Vulnerability from csaf_ncscnl
Published
2025-11-28 09:53
Modified
2025-11-28 09:53
Summary
Kwetsbaarheden verholpen in Mattermost

Notes

The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten
Mattermost heeft kwetsbaarheden verholpen in versies 11.0.x (tot en met 11.0.3), 10.12.x (tot en met 10.12.1), 10.11.x (tot en met 10.11.4) en 10.5.x (tot en met 10.5.12).
Interpretaties
De kwetsbaarheden stellen een geauthenticeerde aanvaller in staat om een account over te nemen via een zorgvuldig vervaardigd e-mailadres tijdens het authenticatieproces. Dit vereist specifieke instellingen die geconfigureerd moeten zijn, wat gebruikersaccounts bloot kan stellen aan ongeautoriseerde toegang. Daarnaast kan een geauthenticeerde aanvaller met teamcreatieprivileges de OAuth state token validatie misbruiken om een gebruikersaccount over te nemen door authenticatiegegevens te manipuleren, vooral als e-mailverificatie is uitgeschakeld. Voor deze laatste kwetsbaarheid moet de kwaadwillende beschikken over twee accounts, waarvan er een nog niet eerder ingelogd is geweest. Misbruik is hiermee ingewikkeld te realiseren.
Oplossingen
Mattermost heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans
medium
Schade
high
CWE-303
Incorrect Implementation of Authentication Algorithm


To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Mattermost heeft kwetsbaarheden verholpen in versies 11.0.x (tot en met 11.0.3), 10.12.x (tot en met 10.12.1), 10.11.x (tot en met 10.11.4) en 10.5.x (tot en met 10.5.12).",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheden stellen een geauthenticeerde aanvaller in staat om een account over te nemen via een zorgvuldig vervaardigd e-mailadres tijdens het authenticatieproces. Dit vereist specifieke instellingen die geconfigureerd moeten zijn, wat gebruikersaccounts bloot kan stellen aan ongeautoriseerde toegang. Daarnaast kan een geauthenticeerde aanvaller met teamcreatieprivileges de OAuth state token validatie misbruiken om een gebruikersaccount over te nemen door authenticatiegegevens te manipuleren, vooral als e-mailverificatie is uitgeschakeld.\n\nVoor deze laatste kwetsbaarheid moet de kwaadwillende beschikken over twee accounts, waarvan er een nog niet eerder ingelogd is geweest. Misbruik is hiermee ingewikkeld te realiseren.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Mattermost heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Incorrect Implementation of Authentication Algorithm",
        "title": "CWE-303"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://mattermost.com/security-updates"
      }
    ],
    "title": "Kwetsbaarheden verholpen in Mattermost",
    "tracking": {
      "current_release_date": "2025-11-28T09:53:42.334621Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2025-0378",
      "initial_release_date": "2025-11-28T09:53:42.334621Z",
      "revision_history": [
        {
          "date": "2025-11-28T09:53:42.334621Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "Mattermost"
          }
        ],
        "category": "vendor",
        "name": "Mattermost"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-12421",
      "cwe": {
        "id": "CWE-303",
        "name": "Incorrect Implementation of Authentication Algorithm"
      },
      "notes": [
        {
          "category": "other",
          "text": "Incorrect Implementation of Authentication Algorithm",
          "title": "CWE-303"
        },
        {
          "category": "description",
          "text": "Mattermost versions 11.0.x up to 11.0.2, 10.12.x up to 10.12.1, 10.11.x up to 10.11.4, and 10.5.x up to 10.5.12 are vulnerable to account takeover via a crafted email address during authentication.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-12421 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2025/cve-2025-12421.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2025-12421"
    },
    {
      "cve": "CVE-2025-12419",
      "cwe": {
        "id": "CWE-303",
        "name": "Incorrect Implementation of Authentication Algorithm"
      },
      "notes": [
        {
          "category": "other",
          "text": "Incorrect Implementation of Authentication Algorithm",
          "title": "CWE-303"
        },
        {
          "category": "description",
          "text": "Mattermost versions 10.12.x, 10.11.x, 10.5.x, and 11.0.x have a vulnerability in OAuth state token validation that allows account takeover by an authenticated attacker under specific conditions.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-12419 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2025/cve-2025-12419.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2025-12419"
    }
  ]
}


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