FKIE_CVE-2026-25742

Vulnerability from fkie_nvd - Published: 2026-04-03 21:17 - Updated: 2026-04-08 19:25
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236
security-advisories@github.comhttps://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae
security-advisories@github.comhttps://github.com/zulip/zulip/releases/tag/11.6
security-advisories@github.comhttps://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "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/\u003cstream_id\u003e/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."
    }
  ],
  "id": "CVE-2026-25742",
  "lastModified": "2026-04-08T19:25:13.093",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-03T21:17:10.060",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zulip/zulip/releases/tag/11.6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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