{"id":"CVE-2026-25742","title":"Zulip is an open-source team collaboration tool","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…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-862"],"vendor":"zulip","product":"zulip","affected":["zulip >= 1.4.0, < 11.6"],"patched":["zulip 11.6"],"published":"2026-04-03","updated":"2026-07-24","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-25742","references":[{"url":"https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236","label":"security-advisories@github.com"},{"url":"https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae","label":"security-advisories@github.com"},{"url":"https://github.com/zulip/zulip/releases/tag/11.6","label":"security-advisories@github.com"},{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w","label":"security-advisories@github.com"},{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00312,"epssPercentile":0.24299,"ingestedAt":"2026-07-25T22:05:04.801Z","slug":"CVE-2026-25742","body":"## Overview\n\nZulip 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.\n\n## Affected\n\n- `zulip >= 1.4.0, < 11.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `zulip 11.6`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}