Auth bypass in Outline
CVE-2026-120489
Outline before 1.12.0 contains an incorrect authorization vulnerability in authorizeDocumentPublish() that allows authenticated members to publish documents into private collections without write access. Attackers can detach a child document via documents.unpublish, retaining parentDocumentId, then call documents.update with a private collection UUID to inject phishing content.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/outline/outline/security/advisories/GHSA-h6ff-rw9x-5mq2 (vendor-advisory)
- github.com/outline/outline/commit/d249b34e8e5fd465d542cad87190d411fdcbd5dc (patch)
- github.com/outline/outline/releases/tag/v1.12.0 (release-notes)
- github.com/outline/outline/blob/v1.11.0/server/commands/documentCreator.ts (technical-description)
- www.vulncheck.com/advisories/outline-before-1.12.0-incorrect-authorization-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120489?
- CVE-2026-120489 is a medium-severity vulnerability in Outline, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-11-02.
- How severe is CVE-2026-120489?
- Medium severity. CVSS v3 base score is 4.3 out of 10.