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Marquis attack exposes 672,000 bank and credit union customers
SSNs and account details were stolen in a 2025 attack.
- Organisation
- Marquis Software
- Disclosed
- 18 March 2026
- Affected
- 672,000
- Data
- SSNs, account details
- Attacker
- Unknown
- Severity
- major
- Region
- Global
- Source
- CM Alliance monthly roundup ↗
Cite this
Nuffield Consulting, “Marquis attack exposes 672,000 bank and credit union customers”, The Daily Tech Wire outage & breach log, 18 Mar 2026. https://techwire.nuffieldconsulting.com/incidents/2026-03-18-marquis-software-breach/ (retrieved 15 Nov 2026).
This entry summarises public reporting. Please also cite the original source: CM Alliance monthly roundup, https://cm-alliance.com/cybersecurity-blog/biggest-cyber-attacks-data-breaches-ransomware-attacks-of-march-2026.
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