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CVE-2026-22246

Estado: AnalizadaMedia (4.3)—

Mastodon is a free, open-source social network server based on ActivityPub. Mastodon 4.3 added notifications of severed relationships, allowing end-users to inspect the relationships they lost as the result of a moderation action. The code allowing users to download lists of severed relationships for a particular event fails to check the owner of the list before returning the lost relationships. Any registered local user can access the list of lost followers and followed users caused by any severance event, and go through all severance events this way. The leaked information does not include the name of the account which has lost follows and followers. This has been fixed in Mastodon v4.3.17, v4.4.11 and v4.5.4.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Joinmastodon — Mastodon

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-22246",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-22246",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-08T15:51:57.907032Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "mastodon",
          "product": "mastodon",
          "versions": [
            {
              "status": "affected",
              "version": "< 4.3.17"
            },
            {
              "status": "affected",
              "version": ">= 4.4.0-beta.1, < 4.4.11"
            },
            {
              "status": "affected",
              "version": ">= 4.5.0-beta.1, < 4.5.4"
            }
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  ],
  "published": "2026-01-08T16:16:02.957",
  "references": [
    {
      "url": "https://github.com/mastodon/mastodon/commit/68e30985ca7afdb89af1b2e9dc962e1993dc8076",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mastodon/mastodon/commit/b2bcd34486fd6681cc0f30028086ef0f47282adf",
      "tags": [
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mastodon/mastodon/commit/c1fb6893c5175d74c074f6f786d504c8bc610d57",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-ww85-x9cp-5v24",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-201"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mastodon is a free, open-source social network server based on ActivityPub. Mastodon 4.3 added notifications of severed relationships, allowing end-users to inspect the relationships they lost as the result of a moderation action. The code allowing users to download lists of severed relationships for a particular event fails to check the owner of the list before returning the lost relationships. Any registered local user can access the list of lost followers and followed users caused by any severance event, and go through all severance events this way. The leaked information does not include the name of the account which has lost follows and followers. This has been fixed in Mastodon v4.3.17, v4.4.11 and v4.5.4."
    },
    {
      "lang": "es",
      "value": "Mastodon es un servidor de red social gratuito, de código abierto, basado en ActivityPub. Mastodon 4.3 añadió notificaciones de relaciones cortadas, permitiendo a los usuarios finales inspeccionar las relaciones que perdieron como resultado de una acción de moderación. El código que permite a los usuarios descargar listas de relaciones cortadas para un evento particular no verifica al propietario de la lista antes de devolver las relaciones perdidas. Cualquier usuario local registrado puede acceder a la lista de seguidores perdidos y usuarios seguidos causada por cualquier evento de corte, y revisar todos los eventos de corte de esta manera. La información filtrada no incluye el nombre de la cuenta que ha perdido seguimientos y seguidores. Esto ha sido corregido en Mastodon v4.3.17, v4.4.11 y v4.5.4."
    }
  ],
  "lastModified": "2026-06-17T10:19:37.690",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6B2706E5-A6D0-4790-A3E6-5DE023465AB2",
              "versionEndExcluding": "4.3.17"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "DD92863A-CB76-45AA-BF4D-9870B24E8109",
              "versionEndExcluding": "4.4.11",
              "versionStartIncluding": "4.4.0"
            },
            {
              "criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3E8FBAF5-C7BC-4980-9780-50BA935D126B",
              "versionEndExcluding": "4.5.4",
              "versionStartIncluding": "4.5.0"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}