National Tax Service (NTS) security incident history
Hacking, data breaches and other security incidents involving National Tax Service (NTS), with related coverage.
Incidents: 2 · Most recent
National Tax Service official suspended for mass leak of taxpayer data
Impact: Mass leak of taxpayer information
An official at Korea's National Tax Service leaked a large volume of taxpayer information. The official was suspended from duty on 25 June 2026.
Read on Daily NTN ↗National Tax Service exposes mnemonic code, about 7 billion won in crypto stolen
Impact: Cryptocurrency worth around 7 billion won
On 26 February 2026, Korea's National Tax Service exposed a mnemonic code for restoring an electronic wallet in a photo attached to a press release on seized virtual assets. A third party used it to steal cryptocurrency worth around 7 billion won. The National Tax Service apologised for the incident, and police opened an investigation.
Read on 한국경제 ↗