CVE-2026-44695: Getoutline Outline

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Outline is a service that allows for collaborative documentation. Prior to 1.7.1, the Slack integration callback for GET /auth/slack.post accepts an unsigned, session-independent OAuth state value. A third party who can obtain a Slack OAuth code for the same Outline Slack client can make a logged-in Outline user complete the callback and link that user's Outline account to the attacker's Slack team_id and user_id. The linked Slack identity can then use the Slack /outline search command as the victim Outline user. This vulnerability is fixed in 1.7.1.

Affected products

• Getoutline Outline: before 1.7.1 (fixed in 1.7.1)

Published 2026-05-11. Last modified 2026-06-17.