People search Steam data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 Steam-linked incidents, with headline counts up to 35M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Steam breach history matters
Steam operates in Media & Entertainment (United States). Across indexed rows, recurring themes include unverified actor or scraping claims. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2011 — — Steam: The November 6 defacement of Steam forums led to an…
Cataloged incident. The November 6 defacement of Steam forums led to an investigation that revealed hackers had accessed a Steam database with sensitive user information. The database contained user names, hashed and salted passwords, game purchases, email addresses, billing addresses, and encrypted credit card information. Users were prompted to change their Steam forum passwords and encouraged to change their Steam account passwords. Anyone using their Steam forum password for other websites should change their Exposed categories include Personal information. BreachHistory cites approximately 35M+ affected records in this row. See the steam2011 and canonical BreachHistory entry.
2011 — — Steam: The Valve Corporation, 35.0M records
Cataloged incident. The Valve Corporation BreachHistory cites approximately 35M+ affected records in this row. See the steamu and canonical BreachHistory entry.
Patterns and analysis
- Unverified actor or scraping claims — appears across multiple Steam 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: Bookmark the Steam company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/steam · Latest: steam2011.
Sources: BreachHistory catalog (2 rows for Steam), company and regulator disclosures cited in individual breach records.