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Slack (Salesforce): Surveillance Profile

Privacy Score: 30/100

A detailed look at how Slack (Salesforce) collects, stores, and uses your personal data.

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Privacy Score

30

Poor

Slack (Salesforce)'s privacy score of 30/100 reflects their data collection practices, transparency, incident history, and user control options. This score indicates significant privacy concerns that users should be aware of.

Data Collected

All messages and file uploads
Channel membership and activity
Direct message contents
User status and online presence
Workspace analytics and productivity data
Third-party app integration data
Device and browser information
IP addresses and login locations
Search queries within workspace
Emoji reactions and usage patterns
Huddle and call metadata
Link click and file access tracking

Known Incidents

In 2015, Slack suffered a data breach that compromised its user database, including usernames, email addresses, hashed passwords, and optionally stored phone numbers and Skype IDs.

Slack's 2018 GDPR compliance update revealed that workspace administrators could export all messages, including private DMs, without notifying users, contradicting expectations of private communication.

In 2023, Slack updated its privacy policy to allow using customer data, including messages and files, to develop and train AI and machine learning models, sparking significant backlash from users and organizations.

A 2020 security vulnerability allowed attackers to take over Slack accounts through HTTP request smuggling, potentially exposing all messages and files in affected workspaces.

In 2019, Slack reset approximately 100,000 passwords after discovering that credentials exposed in a 2015 breach were being used in credential-stuffing attacks.

How to Opt Out

Minimizing data collection in Slack is particularly challenging because most privacy controls are managed by workspace administrators rather than individual users. Start by reviewing what data your workspace retains by checking with your administrator about the workspace's message retention policy. In your personal settings, go to Preferences > Notifications and minimize notification types to reduce engagement tracking. Under Profile & Account, minimize the personal information in your profile. Do not connect third-party apps to Slack unless necessary, as each integration creates new data sharing pathways. Review connected apps regularly under Settings > Manage Apps. Be aware that on paid Slack plans, workspace owners can export all messages including DMs using the Compliance API. On free plans, only public channel messages can be exported, but Slack still retains all data on its servers. Avoid sharing sensitive files through Slack as they are stored indefinitely unless the workspace has a deletion policy. Use Slack's retention settings if you have admin access to auto-delete messages after a set period. Do not use Slack Connect to communicate with external organizations as this creates additional data sharing between workspaces. For private conversations, take them outside Slack to an end-to-end encrypted platform like Signal. In your device settings, review Slack's permissions for camera, microphone, and photos. Use Slack in a browser with privacy extensions rather than the desktop app when possible, as the desktop app has deeper system access. To opt out of AI training, workspace administrators must contact Slack to disable the data sharing. If you are an administrator, enable Enterprise Key Management (EKM) to control encryption keys. For a privacy-focused alternative, consider Element (Matrix), which offers end-to-end encrypted messaging and can be self-hosted, giving your organization complete control over communication data.

Private Alternative

Looking for a privacy-respecting alternative to Slack (Salesforce)? We recommend:

Element

Slack (Salesforce) Surveillance by City

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