https://privacyunpacked.com/breaches/company/substack/feed.xml 2026-02-06T00:00:00Z Privacy Unpacked https://privacyunpacked.com/breaches/company/substack/#substack-2026-02-06 2026-02-06T00:00:00Z

A breach of Substack was added to Have I Been Pwned’s breach database on 6 February 2026. It affected 663,121 accounts. Exposed: Email addresses and Phone numbers. The breach began on 23 October 2025, 106 days before it was reported.