CVE-2026-44695: Outline: Slack OAuth state can link a victim Outline account to an attacker Slack identity
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 teamid and userid. 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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-44695?
CVE-2026-44695 has been classified as a high-severity vulnerability due to potential unauthorized access.
How do I fix CVE-2026-44695?
To fix CVE-2026-44695, you should update your Outline software to version 1.7.1 or later.
What is the impact of CVE-2026-44695?
The impact of CVE-2026-44695 allows a third party to leverage an unsigned OAuth state to gain unauthorized access to the service.
What versions of Outline are affected by CVE-2026-44695?
Any version of Outline prior to 1.7.1 is affected by CVE-2026-44695.
Is a patch available for CVE-2026-44695?
Yes, a patch is available in version 1.7.1 of Outline to address CVE-2026-44695.