Password spray attacks remain highly prevalent and successful in 2026. Rather than testing many passwords against one user, a password spray attack targets many users with the same common password, one attempt at a time. This “low-and-slow” approach helps attackers stay below account lockout thresholds while exploiting weak passwords and credential reuse.
Several key factors make password spraying an appealing tactic for attackers:
- Staying Under the Radar
Traditional brute-force attacks try thousands of passwords against a single account, which often triggers lockouts after too many failed attempts in a short time frame. Password spraying instead tests common passwords like Summer2026! or Welcome1 across many usernames, allowing attackers to avoid basic lockout-based defenses.
- Widespread Credential Reuse
Attackers often use credentials leaked from previous data breaches. Because people frequently reuse the same or similar passwords across personal and corporate accounts, these breach datasets can still provide a high success rate for password spray attempts.
- Automation and AI
AI and automation tools allow attackers to test credentials at scale using large networks of proxy devices. By spreading login attempts across many sources, attackers reduce the chance that any single source will be IP-blocked by the target.
This technique can be particularly effective against single sign-on (SSO) portals and cloud platforms. In June, Huntress Cybersecurity reported a large campaign against Microsoft Azure CLI in which threat actors generated more than 81 million automated login attempts and successfully compromised 78 accounts.
How to Detect a Password Spray Attack
- Watch for legacy or direct username/password authentication flows, such as Resource Owner Password Credentials (ROPC), which can weaken multifactor authentication enforcement or avoid modern interactive authentication controls depending on configuration
- Flag successful sign-ins that immediately follow failed login attempts from a completely different geolocation
- Monitor centralized Security Information and Event Management (SIEM) platforms for unusual increases in failed logins across multiple accounts
Even if you do not have advanced detection tools in place, there are practical steps you can take to reduce the risk of a successful password spray attack.
Defensive Strategies
- Use Multifactor Authentication
Enforce multifactor authentication across all accounts and systems so compromised passwords alone cannot grant access. Where possible, use phishing-resistant multifactor authentication methods. - Block Weak or Common Passwords
Avoid short, predictable, or commonly used passwords. The Cybersecurity and Infrastructure Security Agency (CISA) recommends strong passwords that are long, random, and unique. More information about creating a strong password can be found in CISA’s article Formulate Strong Passwords and Pin Codes. - Change Passwords for Accounts in Data Breaches
If credentials have been leaked in a data breach or account compromise, change the password for the affected account immediately and ensure the new password follows strong password guidance. Accounts can be checked for known exposure at sites like https://haveibeenpwned.com. - Harden Conditional Access Policies
Configure policies inside identity providers like Microsoft Entra ID to block legacy authentication and direct username/password grant flows where possible, including ROPC, and require strong client authentication.
As always, NGT is here to help!
If you have questions about protecting your organization from password spray attacks, contact ngthelp.com.