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CVE-2026-25742

Estado: AnalizadaMedia (5.3)—

Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me/<stream_id>/topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6.

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)

Zulip — Zulip

CWE

Referencias

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{
  "id": "CVE-2026-25742",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-25742",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-08T18:53:23.592418Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "zulip",
          "product": "zulip",
          "versions": [
            {
              "status": "affected",
              "version": "< 11.6"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-04-03T21:17:10.060",
  "references": [
    {
      "url": "https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236",
      "tags": [
        "Patch"
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    },
    {
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      "tags": [
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/zulip/zulip/releases/tag/11.6",
      "tags": [
        "Release Notes"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w",
      "tags": [
        "Exploit",
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me/<stream_id>/topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6."
    },
    {
      "lang": "es",
      "value": "Zulip es una herramienta de colaboración en equipo de código abierto. Antes de la versión 11.6, Zulip es una herramienta de colaboración en equipo de código abierto. Desde la versión 1.4.0 hasta antes de la versión 11.6, incluso después de que el acceso de espectador (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) esté deshabilitado, los archivos adjuntos originados en flujos web-públicos aún pueden ser recuperados anónimamente. Como resultado, el contenido de los archivos permanece accesible incluso después de que se pretenda deshabilitar el acceso público. De manera similar, incluso después de que el acceso de espectador esté deshabilitado, el endpoint /users/me/<stream_id>/topics permanece accesible anónimamente, permitiendo la recuperación del historial de temas para flujos web-públicos. Este problema ha sido parcheado en la versión 11.6. Este problema ha sido parcheado en la versión 11.6."
    }
  ],
  "lastModified": "2026-07-24T22:10:00.140",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:zulip:zulip:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1599A04E-3187-4BCA-A29C-22595CCB1BA8",
              "versionEndExcluding": "11.6",
              "versionStartIncluding": "1.4.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}