Primary definition
A security event, or a combination of multiple security events, that constitutes a security incident in which an intruder gains, or attempts to gain, access to a system or system resource without having authorization to do so.
Also known asbreach · incursion · hacking · cyberattack · unauthorized access · system compromise · penetration · infiltration
6 sources cited4 related termsReviewed Aug 9, 2026
— The State and Local Election Cybersecurity PlaybookView source
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TSLECP
A security event, or a combination of multiple security events, that constitutes a security incident in which an intruder gains, or attempts to gain, access to a system or system resource without having authorization to do so.
The State and Local Election Cybersecurity Playbook · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Intrusion. In Election Security Glossary. Retrieved August 20, 2026, from https://electionsecurityglossary.com/glossary/intrusion
Sources
6 cited · last checked Aug 9, 2026
01
The State and Local Election Cybersecurity Playbook
The State and Local Election Cybersecurity Playbook
High consensus
02
Committee on National Security Systems Glossary CNSSI 4009-2015
Committee on National Security Systems Glossary CNSSI 4009-2015
Multi-source
03
March 2020 CSC Report
March 2020 CSC Report
Disputed
04
NICCS Glossary
NICCS Glossary
Disputed
05
The Cyber Glossary
The Cyber Glossary
Disputed
06
ODNI Cyber Threats to Elections Lexicon
ODNI Cyber Threats to Elections Lexicon
High consensus
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