Substack

1 breach663K affected in allTechsubstack.com

Substack notifies users that emails and phone numbers were stolen in 2025Hacking exposed emails and phone numbers.Hacking663K accountsMediaUSUnverifiedFeb 5

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Every breach here links to its sources and official notices. Across Glyph: lawsuits, incidents and outages.

source_type2026-09-25

Substack, 2026-02-05press

source_url2026-09-25

Substack, 2026-02-05https://www.bleepingcomputer.com/news/security/newsletter-platform-substack-notifies-users-of-data-breach/

country2026-09-25

Substack, 2026-02-05US

sector2026-09-25

Substack, 2026-02-05media

attack2026-09-25

Substack, 2026-02-05hacking

data_types2026-09-25

Substack, 2026-02-05["emails","phone","other"]

disclosed2026-09-25

Substack, 2026-02-052026-02-05

discovered2026-09-25

Substack, 2026-02-052026-02-03

summary2026-09-25

Substack, 2026-02-05Substack told users that an unauthorized party exploited a system flaw in October 2025 to obtain email addresses, phone numbers and internal metadata, which it found in February 2026. A threat actor leaked a database of 697,313 records; Sub

title2026-09-25

Substack, 2026-02-05Substack notifies users that emails and phone numbers were stolen in 2025

Added2026-09-25

Substack, 2026-02-05

Added2026-09-25

Substack