{"id":"CVE-2026-25742","state":"PUBLISHED","title":"Zulip: Anonymous File Access After Disabling Spectator Access","description":"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.","publishedAt":"2026-04-03T20:12:07.296Z","updatedAt":"2026-04-08T18:53:28.819Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["zulip zulip"],"affected":[{"vendor":"zulip","product":"zulip","versions":[{"version":"< 11.6","status":"affected"}]}],"references":["https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w","https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236","https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae","https://github.com/zulip/zulip/releases/tag/11.6"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25742.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25742","state":"PUBLISHED","datePublished":"2026-04-03T20:12:07.296Z","dateUpdated":"2026-04-08T18:53:28.819Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-05T16:48:00.428Z"},"containers":{"cna":{"title":"Zulip: Anonymous File Access After Disabling Spectator Access","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."}],"affected":[{"vendor":"zulip","product":"zulip","versions":[{"version":"< 11.6","status":"affected"}]}],"references":[{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w","name":"https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236","name":"https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236","tags":["x_refsource_MISC"]},{"url":"https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae","name":"https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae","tags":["x_refsource_MISC"]},{"url":"https://github.com/zulip/zulip/releases/tag/11.6","name":"https://github.com/zulip/zulip/releases/tag/11.6","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-03T20:12:07.296Z"},"source":{"advisory":"GHSA-f47p-xjqq-g28w","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-08T18:53:23.592418Z","id":"CVE-2026-25742","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-08T18:53:28.819Z"}}]}}}