Slack Data Breach History
WebsiteSlack is a business communication platform for messaging, file sharing, and app integrations.
This page shows all data breaches of Slack. View the complete breach timeline, records exposed, root causes, and AI breach risk score. BreachHistory tracks disclosed data breaches worldwide.
Data Breach Timeline — All Slack Breaches
- 2022 2022 — Private repos Unknown records Share
- 2015 2015 — Slack: Hacked, 500K records 500.0K records Share
Slack Data Breach Summary
This page tracks the Slack data breach history and cybersecurity incidents affecting Slack. BreachHistory currently indexes 2 publicly disclosed or catalogued incidents spanning 2015 through 2022, with approximately 500 thousand records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.
The Slack breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.
Largest Slack Data Breaches
The largest indexed incidents include the 2015 — Slack: Hacked, 500K records. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Slack or a regulator. Below is the list of large data breaches:
- 2015 2015 — Slack: Hacked, 500K records — about 500.0K records exposed · Catalogued incident
What Information Was Exposed?
Depending on the incident, exposed data may include email addresses, names, physical addresses, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.
Slack Data Breach 2026
At the time of this update, no Slack data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.
What To Do If You Were Affected
If you believe your account may have been involved in a Slack data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.
This Slack breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.