# Protect Against Covert Redirect Phishing Attacks Source: https://keepnetlabs.com/blog/covert-redirect-attacks-and-how-to-get-protected-against-them Published: 2024-01-19 Updated: 2026-10-09 Author: Ozan Ucar, Founder and CEO of Keepnet Category: Security Awareness Training > Covert redirect phishing exploits website vulnerabilities, posing risks like identity theft. Learn how this attack works, the consequences, and how to stay secure with Keepnet's anti-phishing tools. ## Understanding Covert Redirect Phishing and How to Protect Against It In the ever-evolving world of cybersecurity threats, covert redirect attacks have emerged as a dangerous phishing technique. By exploiting legitimate authentication methods like [OAuth](https://keepnetlabs.com/blog/oauth-consent-phishing) and OpenID, hackers gain unauthorized access to sensitive user data on trusted platforms. This article dives into how covert redirects work, their potential impacts on users, and how organizations can protect themselves with the right security awareness training and tools. ## What Is a Covert Redirect? A **covert redirect** is a security breach where hackers exploit an open redirect vulnerability, tricking users into unknowingly interacting with a malicious site. Here’s how the attack typically unfolds: 1. A legitimate-looking link is crafted to redirect users to a page for authenticating an application (e.g., Facebook or Google login). 2. When the user clicks the link, a fake login or authorization window opens, requesting the user’s credentials. 3. Upon granting access, the victim’s information, such as email, contact details, and personal history, can be stolen. 4. In some cases, users may even be redirected to a page loaded with malware, worsening the security breach. These attacks are hard to detect because they exploit **OAuth** and **OpenID**, two commonly trusted authentication protocols. **Wang Jing**, a Ph.D. student, first reported this vulnerability in 2014, noting how it affected large tech giants like Facebook, Google, Yahoo, and Microsoft. ### How Hackers Use Covert Redirect for Phishing Covert redirect phishing relies on vulnerabilities in a site’s authentication system. Instead of verifying where users are being redirected, affected platforms leave a gap for hackers to inject malicious links. Here’s a closer look at how hackers exploit covert redirects: 1. **Luring Users with Fake Prompts**: The phishing link appears legitimate, leading users to trust the prompt that follows, which may resemble the usual OAuth or OpenID consent form. 2. **Stealing Login Credentials**: If a user grants permission on the fake login page, hackers can capture the login information and other sensitive details, such as emails, birthdates, or even work history. 3. **Redirection to Malicious Pages**: Hackers often redirect victims to malware-infected sites, putting their devices at further risk of malware infection and system compromise. Because these phishing attacks closely resemble real login pages and authorization processes, they’re alarmingly effective. ## Potential Impact of Covert Redirect Attacks on Users and Organizations Covert redirect attacks can lead to severe consequences for both individual users and organizations, including: - **Identity Theft**: With access to personal information, attackers can impersonate users on other platforms, leading to reputational damage and financial loss. - **Data Breaches**: Compromised information could expose entire corporate networks if an employee unknowingly interacts with covert redirects on their work devices. - **Malware Infections**: Redirects to malicious sites expose users to malware that could further compromise their systems and data. - **Loss of User Trust**: If platforms like Facebook or Google experience a significant attack, it can affect public confidence in these services’ security. ## How to Guard Against Covert Redirect Phishing Attacks Preventing covert redirects requires both technical defenses and user awareness. Here are some effective steps: ###### **1. Implement Strong Security Awareness Training** Security awareness training is the cornerstone of phishing prevention. Training employees and end-users to recognize phishing attempts significantly reduces the likelihood of covert redirects and other phishing attacks succeeding. Platforms like [Keepnet](https://keepnetlabs.com/blog/cyber-security-awareness-training-for-employees) provide comprehensive security awareness training programs, which include simulated phishing attacks to help employees recognize phishing attempts. ###### **2. Use Multi-Layered Anti-Phishing Tools** An effective way to secure against phishing attacks, including covert redirects, is by deploying multi-layered anti-phishing tools. Solutions like the [Phishing Simulator](https://keepnetlabs.com/products/phishing-simulator) can replicate real phishing scenarios, helping users practice safe responses to suspicious links and prompts. ###### **3. Limit and Monitor Open Redirects** For organizations with applications using OAuth or OpenID, limit the number of redirects allowed and monitor them rigorously. Some practical steps include: - Setting up a whitelist of trusted URLs that users can be redirected to. - Implementing strict checks to validate redirect URLs. - Regularly testing for vulnerabilities to catch covert redirects early. ###### **4. Regularly Update Authentication Protocols** OAuth and OpenID are popular protocols for secure access, but outdated versions can contain vulnerabilities. Ensure that your organization's authentication systems are up-to-date and consider adding layers like multi-factor authentication (MFA) to reduce the risk of covert redirect phishing. [Read more about MFA security enhancements here](https://keepnetlabs.com/blog/understanding-mfa-phishing-protection-measures-and-key-statistics). ###### **5. Use Advanced secure behaviour management platforms** Keepnet’s secure behaviour management platform offers a broad suite of tools designed to identify and mitigate human-related risks in cybersecurity. This platform allows for monitoring risky behavior patterns among users, helping organizations stay alert to potential covert redirects and similar phishing tactics. Learn more about [Keepnet's platform for human risk management and secure behaviour management](https://keepnetlabs.com/). ## Benefits of Using Keepnet for Covert Redirect Protection Keepnet provides a holistic approach to **anti-phishing** and security awareness. Here’s how its platform can specifically help protect against covert redirects: - **Phishing Simulations**: The Phishing Simulator prepares users to recognize various phishing tactics by running simulations that mimic real-world covert redirect attacks. - **Security Awareness Training**: Keepnet’s [Security Awareness Training](https://keepnetlabs.com/products/security-awareness-training) enhances user knowledge on phishing schemes, helping them detect covert redirects and other types of phishing. - **Risk Scoring and Analysis**: With a human risk management approach, organizations can monitor and evaluate employee response to simulated attacks, identifying any weak spots that could lead to covert redirect attacks. - **Incident Response Tools**: The Incident Responder tool by Keepnet offers fast detection and response capabilities, allowing organizations to quickly neutralize threats that may arise from covert redirect incidents. [Explore Keepnet's Incident Responder](https://keepnetlabs.com/products/incident-responder). ## Final Thoughts: Covert Redirect Phishing Requires Proactive Protection Covert redirect phishing attacks are complex, taking advantage of established authentication protocols to mislead users and steal sensitive information. With adequate training and anti-phishing tools, organizations can drastically reduce the risks associated with covert redirects and other sophisticated phishing tactics. Using Keepnet’s suite of **security awareness** and **anti-phishing** solutions offers a proactive way to protect against these threats, ensuring your users and data remain safe from covert redirect attacks. ***Editor's Note: This article was updated on March 12, 2026***. ## Frequently Asked Questions ### What is a covert redirect attack? A covert redirect abuses a legitimate site's open redirect function so a link that begins with a trusted domain sends the victim somewhere else. The visible part of the address is genuine, which is what makes it work. ### How do attackers use covert redirects for phishing? They build a link on a trusted domain, often a login or authorisation endpoint, with a redirect parameter pointing to their own page. Hovering over the link shows the trusted domain, so the usual check passes. ### Why are covert redirects hard to detect? Because reputation based filtering sees a known good domain. The malicious destination only appears after the redirect resolves, and by then the user is already on the page. ### What is the impact of a covert redirect attack? Credential theft, authorisation token theft in OAuth flows, and malware delivery, all with a higher success rate than a normal phishing link because the initial address survives inspection. ### How do you protect against covert redirects? Limit and monitor open redirects on your own domains, use link protection that resolves the final destination, keep authorisation flows strict about redirect targets, and train employees to verify the destination rather than the visible link. ### What should employees be taught here? That checking the domain in a link is necessary but not sufficient. If a familiar link lands on an unexpected login page, that is the moment to stop and report rather than sign in.