Outline up to 1.7.0 /auth/slack.post team_id/user_id cross-site request forgery

Summaryinfo

A vulnerability labeled as problematic has been found in Outline up to 1.7.0. This vulnerability affects unknown code of the file /auth/slack.post. The manipulation of the argument team_id/user_id results in cross-site request forgery. This vulnerability is cataloged as CVE-2026-44695. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Outline up to 1.7.0. It has been classified as problematic. Affected is an unknown part of the file /auth/slack.post. The manipulation of the argument team_id/user_id with an unknown input leads to a cross-site request forgery vulnerability. CWE is classifying the issue as CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-44695 since 05/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 1.7.1 eliminates this vulnerability.

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Productinfo

Name

• Outline

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7.0

Website

• Product: https://github.com/outline/outline/

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