CVE-2026-43889 – Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share

CVE ID :CVE-2026-43889

Published : May 11, 2026, 10:22 p.m. | 8 minutes ago

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.

Severity: 6.5 | MEDIUM

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