Slack

The Slack integration detects a variety of data loss prevention, account misconfiguration, and user security risks in an integrated Slack Workspace that could leave you and your organization vulnerable.

Integration prerequisites

• A Slack user account
• Membership in a Slack Workspace (Free, Pro, Business+, or Enterprise Grid)
• If you are not the Workspace Owner and the Require App Approval setting is enabled for the Workspace, request permission to install apps.

Integration permissions

For the Slack integration to function, Cloudflare CASB requires the following Slack API permissions:

• channels:read
• files:read
• groups:read
• users:read

These permissions follow the principle of least privilege to ensure that only the minimum required access is granted. To learn more about each permission, refer to the Slack Permission scopes reference.

Security findings

The Slack integration currently scans for the following findings, or security risks. Findings are grouped by category and then ordered by severity level.

To stay up-to-date with new CASB findings as they are added, bookmark this page or subscribe to its RSS feed.

User account settings

Finding	Severity	Description
Slack User 2FA Disabled	Critical	A user in the Slack Workspace does not have two-factor authentication (2FA) enabled for their account.
Slack User Email Not Confirmed	High	A user in the Slack Workspace has not verified the email they use to sign in.

Channel sharing

Finding	Severity	Description
Slack Channel Shared Externally	High	A channel in the Slack Workspace has been shared with users who are not members of the Workspace.

File sharing

Finding	Severity	Description
Slack File Publicly Accessible	Medium	An external link has been created for a file uploaded to the Slack Workspace.
Large File (2GB+) Shared in Slack	Low	A file ≥ 2 GB has been uploaded to the Slack Workspace.