{"id":"CVE-2026-43889","state":"PUBLISHED","title":"Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share","description":"Outline is a service that allows for collaborative documentation. Prior to 1.7.0, the shares.create API accepts both collectionId and documentId simultaneously and, when published=false, only verifies read access for each—skipping the \"share\" permission check. A subsequent shares.update authorizes publication using an OR policy (can share collection OR can share document), so an attacker who holds share permission on one unrelated collection can publish a share that exposes an arbitrary document they cannot legitimately share, making it publicly accessible to unauthenticated users. This vulnerability is fixed in 1.7.0.","publishedAt":"2026-05-11T21:10:38.105Z","updatedAt":"2026-05-12T13:38:04.105Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["outline outline"],"affected":[{"vendor":"outline","product":"outline","versions":[{"version":"< 1.7.0","status":"affected"}]}],"references":["https://github.com/outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43889.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43889","state":"PUBLISHED","datePublished":"2026-05-11T21:10:38.105Z","dateUpdated":"2026-05-12T13:38:04.105Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-04T15:17:09.330Z"},"containers":{"cna":{"title":"Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share","descriptions":[{"lang":"en","value":"Outline is a service that allows for collaborative documentation. Prior to 1.7.0, the shares.create API accepts both collectionId and documentId simultaneously and, when published=false, only verifies read access for each—skipping the \"share\" permission check. A subsequent shares.update authorizes publication using an OR policy (can share collection OR can share document), so an attacker who holds share permission on one unrelated collection can publish a share that exposes an arbitrary document they cannot legitimately share, making it publicly accessible to unauthenticated users. This vulnerability is fixed in 1.7.0."}],"affected":[{"vendor":"outline","product":"outline","versions":[{"version":"< 1.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm","name":"https://github.com/outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-11T21:10:38.105Z"},"source":{"advisory":"GHSA-rg4j-pmch-w6pm","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-12T13:37:36.810364Z","id":"CVE-2026-43889","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-12T13:38:04.105Z"}}]}}}