Primary definition
1. Security incident that results in the transfer of classified or CUI information onto an information system not accredited (i.e., authorized) for the appropriate security level. (CNSSI-4009) (NISTIR) 2. Synonym(s): data spill, data breach
Also known asdata spill · data breach
2 sources cited4 related termsReviewed Aug 10, 2026
— The Cyber GlossaryView source
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TCG
1. Security incident that results in the transfer of classified or CUI information onto an information system not accredited (i.e., authorized) for the appropriate security level. (CNSSI-4009) (NISTIR) 2. Synonym(s): data spill, data breach
The Cyber Glossary · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Spillage. In Election Security Glossary. Retrieved August 21, 2026, from https://electionsecurityglossary.com/glossary/spillage
Sources
2 cited · last checked Aug 10, 2026
01
The Cyber Glossary
The Cyber Glossary
High consensus
02
NICCS Glossary
NICCS Glossary
Multi-source
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