Governing Identity and Permissions in Slack Workspaces

Slack is where work happens. It's also where sensitive data—passwords, API keys, customer PII—is often casually shared.

Because Slack feels "internal" and "safe," users lower their guard. But from an identity perspective, Slack is a complex ecosystem of users, guests, and bots that requires strict governance.

The Hidden Risks in Slack

**Shared Channels:** Connecting your Slack to a vendor's Slack creates a bridge. If they get breached, can the attacker pivot to you?

**App Integrations:** "Fun" bots (poll makers, gif generators) often ask for extensive scopes like viewing channel history.

**Guest Accounts:** Single-Channel Guests vs. Multi-Channel Guests. Are they offboarded when their contract ends?

Step 1: User Governance

**SSO Enforcement:** Mandate SSO for all logins. This ensures that when you disable an employee in Okta/AD, they lose Slack access immediately.

**Guest Expiration:** Set expiration dates for all guest accounts. Force a renewal process every 90 days.

**Session Duration:** Don't let sessions last forever. Force a re-login every few weeks to validate access.

Step 2: App Governance

**App Whitelisting:** Switch Slack to "Approve Apps" mode. Users cannot install bots without admin review.

**Scope Review:** When approving an app, look at the scopes. Does a "Lunch Poll" app really need `channels:history` (read all messages)? If so, reject it.

**Regular Purge:** Audit installed apps quarterly. Remove any that haven't been used in 6 months.

Step 3: Data Loss Prevention (DLP)

**Slack Connect:** Strictly control who can create Slack Connect channels with external organizations. Log and monitor these connections.

**DLP Integration:** Use Slack's Discovery APIs (available on Enterprise Grid) to scan for secrets and PII posted in public channels.

Step 4: Admin Governance

**Owner Limits:** Limit the number of Workspace Owners and Org Owners.

**Audit Logs:** Slack keeps logs, but they are hard to search. Export them to your SIEM or analysis tool (like Cydenti) to look for anomalies, such as an admin downloading the entire workspace export.

How Cydenti Helps

Cydenti provides granular visibility into your Slack identity layer.

**Bot Analysis:** We highlight over-privileged bots and apps that represent a risk.

**Cross-Platform Context:** If a user is compromised in M365, Cydenti can trigger a suspension of their Slack account to prevent them from using ChatOps to damage infrastructure.

**Private Channel Discovery:** Without reading the messages (privacy first), we can identify "Shadow Channels" where sensitive work might be happening without oversight.

Conclusion

Slack is more than a chat app; it is an operating system for your business. Securing it requires treating it with the same seriousness as your email server. Control the bots, manage the guests, and keep the conversation secure.