{"id":"CVE-2026-40300","state":"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to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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.","publishedAt":"2026-05-12T16:33:02.829Z","updatedAt":"2026-05-13T12:44:55.899Z","severity":{"score":6,"label":"Medium","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["zulip zulip"],"affected":[{"vendor":"zulip","product":"zulip","versions":[{"version":"< 12.0","status":"affected"}]}],"references":["https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr"],"weaknesses":["CWE-284"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40300.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40300","state":"PUBLISHED","datePublished":"2026-05-12T16:33:02.829Z","dateUpdated":"2026-05-13T12:44:55.899Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-10T20:22:44.035Z"},"containers":{"cna":{"title":"Zulip: Message edit history visible in \"moves only\" policy through /api/v1/messages/{id}/history","descriptions":[{"lang":"en","value":"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to 12.0, With message_edit_history_visibility_policy set to \"moves\", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages.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."}],"affected":[{"vendor":"zulip","product":"zulip","versions":[{"version":"< 12.0","status":"affected"}]}],"references":[{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr","name":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","lang":"en","description":"CWE-284: Improper Access Control","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-12T16:33:02.829Z"},"source":{"advisory":"GHSA-jp8f-mvv6-89cr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89cr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T12:44:51.828387Z","id":"CVE-2026-40300","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T12:44:55.899Z"}}]}}}