Cybersecurity statistics / Legacy Systems

Legacy Windows operating systems are most prevalent in retail (39%), healthcare (35%), and financial services (29%).

Publisher	Forescout
Report	The Riskiest Connected Devices in 2026
Published	23 March 2026
Topics	Legacy Systems, Retail, Healthcare, Legacy Windows OS

Published by Forescout in The Riskiest Connected Devices in 2026, 23 March 2026. The figure is taken from the report as published; the full methodology is in the source.

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12 sources answer what share of organisations have an ai governance policy in place. They report between 18% and 44%, with a median of 36.5%.

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Related statistics

Legacy systems in financial organizations are protected by MFA at a rate of 50%.

Secret Double Octopus, 12/07/2026

Among organizations that cite regulatory compliance as a top driver to modernize, 79% report that at least half their applications and infrastructure are legacy.

Secret Double Octopus, 12/07/2026

51% of IAM leaders and stakeholders cite the inability to support legacy apps and infrastructure as an obstacle to universal phishing-resistant MFA.

Secret Double Octopus, 12/07/2026

54% of financial organizations report that at least half their applications and infrastructure are legacy.

Secret Double Octopus, 12/07/2026

The GoodTech Telnet Server Buffer Overflow vulnerability generated 42.2 million detection events in the financial services industry in the first half of 2026.

SonicWall, 12/07/2026

Difficulty securing legacy systems is reported by 34.5% of IT and security professionals and visibility gaps are reported by 33.8%.

Bitdefender, 04/07/2026

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