People search Trello data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 1 Trello-linked incident, with headline counts up to 15.1M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Trello breach history matters
Trello operates in Technology (United States). Across indexed rows, recurring themes include zero-day exploitation and malware. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2024 — 15.1M email addresses
Cataloged incident. Jan 2024. Threat actor "emo" exploited unsecured Trello REST API to map email addresses to Trello accounts. Used 500M emails from prior breaches; identified 15.1M linked to Trello. Data released on Breached forum Jul 2024. Exposed: emails, names, usernames, user IDs, profile URLs. Atlassian secured API after discovery. Exposed categories include Email addresses, names, usernames, user IDs. BreachHistory cites approximately 15.1M+ affected records in this row. See the trello2024 and canonical BreachHistory entry.
Patterns and analysis
- Zero-day exploitation and malware — appears across multiple Trello catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Review OAuth app permissions and revoke unused third-party integrations.
- Step 5: Bookmark the Trello company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/trello · Latest: trello2024.
Sources: BreachHistory catalog (1 row for Trello), company and regulator disclosures cited in individual breach records.