Outline: Unauthorized Document Publication via Mixed collectionId+documentId Share_CVE-2026-43889

6.5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

Basic Information

ID CVE-2026-43889

Source GitHub_M

Published May 11, 2026 at 21:10

Affected Product

Vendor outline

Product outline

Version < 1.7.0

Affected Versions outline outline < 1.7.0

CWE Classification

CWE-863

References

github.com /outline/outline/security/advisories/GHSA-rg4j-pmch-w6pm

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    "published": "2026-05-11T21:10:38.105Z",
    "modified": "2026-05-11T21:10:38.105Z",
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