TERM

data breach

The unauthorized movement or disclosure of sensitive information to a party, usually outside the organization, that is not authorized to have or see the information.

Updated

Jan 06, 2026

Senses

Sense 1

The unauthorized movement or disclosure of sensitive information to a party, usually outside the organization, that is not authorized to have or see the information.

NICCS (CISA) Cybersecurity Vocabulary

Bibliography

NICCS (CISA) Cybersecurity Vocabulary
Accessed Jan 06, 2026Quoted
NICCS glossary export (CSV)
https://niccs.cisa.gov/rest/vocab/export-csv
NICCS is a CISA (DHS) program. Individual glossary entries include a "From" attribution (e.g., CNSSI 4009, NIST SPs, NICE Framework). Treat "From" values as upstream provenance and verify before quoting large portions of text.
Source: NICCS (CISA) Cybersecurity Vocabulary (niccs.cisa.gov).