Credential Stuffing

In the rapidly evolving digital landscape, businesses grapple with a myriad of cybersecurity threats. Among these, credential stuffing emerges as a serious challenge, especially for enterprises with large user bases. This article goes into the intricacies of credential stuffing, unraveling its dangers, exploitation methods, and mitigation strategies.

Unraveling Credential Stuffing

At its core, credential stuffing is a type of cyber attack where threat actors use stolen account credentials (usernames and passwords) to gain unauthorized access to user accounts across various platforms. This technique thrives on the common practice of reusing passwords across multiple services. A number of notable stories involve companies like Norton (2023), Visible (2021), Instacart (2020).

Attackers leverage large-scale automated login requests, exploiting the fact that many users' credentials are identical across several sites. According to Okta, credential stuffing accounts for 34% of overall traffic/authentication events on their platform.

Credential stuffing attacks can be extremely damaging because if an attacker is successful they can mascerade as a real customer. They could potentially access financial, personal and medical information. Additionally if one password was successful, there's a higher likelihood that it might work on other services. Additionally for companies, they spend a considerable amount of time investigating these types of attacks since they're not easy to detect. Additionally, news of a "breach" could be damaging before a proper investigation is conducted.

How Credential Stuffing Strikes

The execution of credential stuffing involves several stages. Initially, attackers get credentials from various sources, such as previous data breaches. They then deploy automated bots to test these credentials across numerous websites. These bots can simulate human login behavior, bypassing basic security measures. The scale and automation of these attacks make them particularly challenging to detect and counteract. Once the attacker gets access to a system, they can perform any of the functions a regular user. They can use that access to steal money, conduct other attacks like social engineering or impersonate the user with others.

Fortifying Against the Threat

To combat credential stuffing, companies need a multifaceted approach:

  1. Implement Robust Authentication Methods: Utilize multi-factor authentication (MFA) to add an extra layer of security.

  2. Rate Limiting: Implementing authentication limits on IP's or devices can help slow down attackers.

  3. Adding a captcha: Adding a captcha into login flows can prevent bots from being able to attempt logins. This is currently effective but the use of AI will make them less effective.

  4. Educate Employees and Users: Awareness about the dangers of password reuse can significantly reduce vulnerability.

  5. Deploy Advanced Security Solutions: Invest in security solutions that detect and prevent automated bot attacks.

  6. Regularly Monitor and Audit: Continuous monitoring for suspicious activities can help in early detection and response.


In conclusion, credential stuffing poses a significant threat to enterprises, demanding a proactive and comprehensive defense strategy. Through education, robust authentication practices, and advanced technological solutions like Corgea, businesses can shield themselves effectively against this silent but devastating cyber menace.

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