Incident

Primary definition

An occurrence that results in actual or potential jeopardy to the confidentiality, integrity, or availability of an information system or the information the system processes, stores, or transmits or that constitutes a violation or imminent threat of violation of security policies, security procedures, or acceptable use policies. See cyber incident. See also event, security-relevant, and intrusion. Source: FIPS PUB 200 (adapted)

Also known ascyber incident · security incident · breach · compromise · intrusion · event · security event · cyber event
3 sources cited4 related termsReviewed Aug 9, 2026
Committee on National Security Systems Glossary CNSSI 4009-2015View source

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CNSSGC

An occurrence that results in actual or potential jeopardy to the confidentiality, integrity, or availability of an information system or the information the system processes, stores, or transmits or that constitutes a violation or imminent threat of violation of security policies, security procedures, or acceptable use policies. See cyber incident. See also event, security-relevant, and intrusion. Source: FIPS PUB 200 (adapted)

Committee on National Security Systems Glossary CNSSI 4009-2015 · 2024

Cite this term

Permanent URL · stable across revisions
Election Security Glossary. (2026). Incident. In Election Security Glossary. Retrieved August 20, 2026, from https://electionsecurityglossary.com/glossary/incident

Sources

3 cited · last checked Aug 9, 2026

01

Committee on National Security Systems Glossary CNSSI 4009-2015
Committee on National Security Systems Glossary CNSSI 4009-2015

High consensus

View source

02

NICCS Glossary
NICCS Glossary

Disputed

View source

03

The Cyber Glossary
The Cyber Glossary

Multi-source

View source

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