{"id":"CVE-2026-43889","summary":"Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share","details":"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.","aliases":["GHSA-rg4j-pmch-w6pm"],"modified":"2026-07-08T08:12:46.477961Z","published":"2026-05-11T21:10:38.105Z","database_specific":{"cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43889.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43889.json"},{"type":"ADVISORY","url":"https://github.com/outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43889"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/outline/outline","events":[{"introduced":"0"},{"fixed":"568b4ac074c67c5c58c75637c3a60b41f5bb1e6b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.7.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.6.1","v1.6.0","v1.5.0","v1.4.0","v1.2.0","v1.2.0-0","v1.1.0","v1.0.1","v1.0.0","v0.87.4","v0.87.2","v0.87.1","v0.87.0","v0.86.0","v0.82.0","v0.80.2","v0.80.1","v0.80.0","v0.79.1","v0.79.0","v0.78.0-0","v0.77.1","v0.77.0","v0.76.2-0","v0.76.1","v0.76.0","v0.76.0-2","v0.76.0-1","v0.76.0-0","v0.75.2","v0.75.1","v0.75.0","v0.73.1","v0.73.0","v0.72.0","v0.71.0","v0.70.2","v0.70.1","v0.70.0","v0.69.1","v0.69.0","v0.67.2","v0.67.1","v0.67.0","v0.67.0-pre.1","v0.66.0","v0.65.1","v0.65.0","v0.64.3","v0.64.2","v0.64.1","v0.64.0","v0.63.0","v0.62.0","v0.61.0","v0.60.1","v0.60.0","v0.59.0","v0.58.0","v0.57.0","v0.56.0","v0.55.0","v0.54.0","v0.53.1","v0.53.0","v0.52.0","v0.51.0","v0.50.0","v0.49.0","v0.48.1","v0.48.0","v0.46.0","v0.45.0","v0.44.0","v0.43.3","v0.43.2","v0.43.1","v0.43.0","v0.42.2","v0.42.1","v0.42.0","v0.41.0","v0.40.2","v0.40.1","v0.40.0","v0.39.0","0.39.0","v0.38.1","v0.38.0","v0.37.0","v0.36.1","v0.36.0","v0.35.0","v0.34.0","v0.33.0","v0.32.0","v0.31.0","v0.30.0","v0.29.0","v0.28.0","v0.27.0","v0.26.0","v0.25.0","v0.24.0","v0.23.0","v0.22.1","v0.22.0","v0.21.0","v0.20.0","v0.19.1","v0.19.0","v0.18.0","v0.16.3","v0.16.2","v0.17.0","v0.16.1","0.16.0","v0.15.1","v0.15.0","v0.14.0","v0.13.5","v0.13.4","v0.13.3","v0.13.2","v0.13.1","v0.9.0","v0.8.1","v0.8.0","v0.7.0","v0.6.1","v0.6.0","v0.5.0","v0.4.0","v0.3.1","v0.3.0","v0.2.0","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43889.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}