{"id":"CVE-2026-40300","aliases":["EUVD-2026-29537","GHSA-jp8f-mvv6-89cr"],"status":"published","title":"Zulip: Message edit history visible in \"moves only\" policy through /api/v1/messages/{id}/history","description":"Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.","severity":{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00247,"percentile":0.1613,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284"],"published":"2026-05-12T16:33:02Z","modified":"2026-10-28T02:31:04Z","products":[{"vendor":"zulip","product":"zulip"},{"vendor":"zulip","product":"zulip_server"}],"references":[{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr","tags":["x_refsource_CONFIRM","exploit","Exploit","Vendor Advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40300.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40300","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-40300","title":"Zulip: Message edit history visible in \"moves only\" policy through /api/v1/messages/{id}/history","description":"Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.","status":"published","published":"2026-05-12T16:33:02.829Z","modified":"2026-05-13T12:44:55.899Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T13:43:11.445168Z"}],"euvd":[{"id":"EUVD-2026-29537","description":"Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.","status":"published","published":"2026-05-12T16:33:02Z","modified":"2026-05-13T12:44:55Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:04:34.274348Z"}],"nvd":[{"id":"CVE-2026-40300","description":"Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.","status":"published","published":"2026-05-12T17:16:20.15Z","modified":"2026-06-17T10:44:57.937Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:12:18.613259Z"}],"osv":[{"id":"CVE-2026-40300","title":"Zulip: Message edit history visible in \"moves only\" policy through /api/v1/messages/{id}/history","description":"Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.","status":"published","published":"2026-05-12T16:33:02.829Z","modified":"2026-10-28T02:31:04.177745911Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:45:03.424067Z"}]}}