Primary definition
Security incident that occurs whenever classified data is spilled either onto an unclassified information system or to an information system with a lower level of classification. (CNSSI-4009) (NISTIR)
Also known asspillage · data spill · classified spill · classified data spill · information spillage · security spill · CIS
1 sources cited4 related termsReviewed Aug 10, 2026
— The Cyber GlossaryView source
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TCG
Security incident that occurs whenever classified data is spilled either onto an unclassified information system or to an information system with a lower level of classification. (CNSSI-4009) (NISTIR)
The Cyber Glossary · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Classified Information Spillage. In Election Security Glossary. Retrieved August 20, 2026, from https://electionsecurityglossary.com/glossary/classified-information-spillage
Sources
1 cited · last checked Aug 10, 2026
01
The Cyber Glossary
The Cyber Glossary
Single-source
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