Quest Diagnostics
Parsippany, United States2 sources
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 22 Oct 2026.
Quest Diagnostics confirms cyberattack on Quanum ordering system
Medical lab testing giant Quest Diagnostics confirmed a cyberattack and data breach affecting patients' personal and health data. The company told the SEC that its Quanum LSM ordering system was accessed and patient records are believed to be involved.
- Type
- Data breach
- Sector
- Healthcare
- First reported
- 22 Oct 2026
- Latest source
- 23 Oct 2026
What to do
- If you have an account, change that password, and anywhere you reused it.
- Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
- Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
- If payment cards were involved, watch statements and ask your bank for a new card.
- If government ID or social security numbers were involved, consider a credit freeze.
- If this is a vendor of yours, ask what of your data they held and whether it was in scope.
- Reset any API keys, SSO trusts or shared credentials you have with them.
- Brief your help desk: attackers often impersonate the breached brand next.
Not sure? Ask an assistant with the sources attached, or have a coding agent check your systems.
Check your systems for Quest Diagnostics
Sources
2- sec.gov23 Oct 2026sec.gov/Archives/edgar/data/0001022079/000094787126000941/ss6979200_8k.htm
- sec.govFiling22 Oct 2026Form 8-K, 2026-10-22
Confidence 80% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.