Security firm Huntress detected a 155-fold increase in password spraying attacks during the first half of 2026, with one campaign generating over 81 million login attempts in just two weeks.
The surge exploits vulnerabilities in legacy authentication systems and gaps in multifactor authentication (MFA) policies that leave certain login flows unprotected.
Password spraying attacks work by systematically attempting common passwords across many user accounts, rather than targeting individual accounts with multiple passwords. This approach often bypasses rate-limiting defenses designed to stop brute-force attacks.
Huntress found that attackers successfully leveraged unprotected authentication endpoints where MFA policies either didn't apply or were incompletely implemented. Organizations with inconsistent MFA rollouts across different login paths proved particularly vulnerable.
The findings underscore a critical security gap: implementing MFA across all authentication flows, not just primary login portals, is essential. Legacy systems that predate modern security standards remain a significant risk factor for enterprises managing mixed infrastructure.
Security experts recommend auditing all login pathways for MFA coverage, enforcing conditional access policies, and monitoring for anomalous login patterns as immediate mitigation steps.
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