CVE-2026-43889
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.
- Score
- CVSS 3.1 6.5 Medium
- Status
- Deferred - security-advisories@github.com
- Published
- 2026-05-11
- Last modified
- 2026-05-12
- Weaknesses
- CWE-863
Affected products
References
- https://github.com/outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm
