People search Kaiser Permanente data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 1 Kaiser Permanente-linked incident, with headline counts up to 13.4M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Kaiser Permanente breach history matters
Kaiser Permanente operates in Technology (United States). Across indexed rows, recurring themes include third-party and supply-chain exposure. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2024 — 13.4M members (tracking code leak)
Cataloged incident. Kaiser Permanente confirmed the largest healthcare data breach of 2024 in April, affecting 13.4 million current and former members. Tracking technologies on Kaiser's websites and mobile apps inadvertently shared patient data with third-party advertisers including Google, Microsoft, and X. Exposed data included member names, IP addresses, sign-in status, navigation behavior, and health encyclopedia search terms. Exposed categories include Names, IP addresses, sign-in status, navigation behavior, health search terms. BreachHistory cites approximately 13.4M+ affected records in this row. See the kaiser2024 and canonical BreachHistory entry.
Patterns and analysis
- Third-party and supply-chain exposure — appears across multiple Kaiser Permanente 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 Kaiser Permanente company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/kaiser · Latest: kaiser2024.
Sources: BreachHistory catalog (1 row for Kaiser Permanente), company and regulator disclosures cited in individual breach records.