What Is Credential Harvesting? Protect Your Organization

Credential harvesting is a significant cybercrime where attackers steal usernames and passwords to gain unauthorized access to systems and data. By impersonating legitimate users, cybercriminals can bypass security measures, infiltrate networks, and cause extensive harm. This growing threat demands attention as it exposes organizations to data breaches, financial losses, and operational disruptions. Learn more: What Is Phishing How To Protect Yourself From It.

Credentials are the payload attackers want most. Credential data appears in 28% of breaches, stolen credentials are the initial access route in 13%, and phishing opens another 16%, while the human element is involved in 62% of breaches overall (Verizon, 2026 Data Breach Investigations Report, p. 12, p. 15 and p. 38). Harvesting is the step that turns a convincing message into a working login.

This blog post explores how credential harvesting works, its impact, and strategies to prevent it.

What Is Credential Harvesting?

Credential harvesting is the process of stealing usernames and passwords to enable unauthorized access to networks, systems, and sensitive data. Cybercriminals may exploit these stolen credentials directly or sell them on the dark web for others to use. This practice is a significant concern for organizations, as it can lead to widespread data breaches and operational risks.

How Credential Harvesting Attacks Work

Attackers use a variety of methods to harvest credentials, including:

• Phishing: Fake emails mimic trusted entities, tricking users into entering their credentials on fraudulent websites. Tools like the Keepnet Phishing Simulator can prepare organizations against such attempts.
• Malware: Programs like RedLine Stealer extract login information directly from infected devices.
• Man-in-the-Middle (MitM) Attacks: Intercepting communications to capture sensitive login details.
• Social Engineering: Manipulating individuals into revealing passwords through deception.
• DNS Spoofing and RDP Attacks: Targeting networks and devices to steal login credentials.

Once attackers gain access, they use the stolen credentials to infiltrate systems, access sensitive data, and move laterally within the network, often undetected.

A Credential Harvesting Attack That Arrived as a Calendar Invitation

Credential harvesting does not have to reach you by email. In August 2026 a member of the Keepnet executive team received a Google Calendar invitation to a pre-bid meeting. The invitation carried a procurement pretext and a bid reference number, and it asked the recipient to review the bid package before the session. The link led to a copy of the Google sign-in screen hosted on an unrelated third-party domain.

Two details in that attack explain why this technique keeps working. The notification was sent by Google Calendar rather than by the attacker, so it passed SPF, DKIM and DMARC and reached the recipient as a legitimate message from Google. And the link parameter carried an encoded version of the genuine Google sign-in address, which is how harvesting kits return the victim to the real service once the password has been submitted. The person sees a normal login and never learns that the credentials were captured on the way through.

The lesson for defenders is that the collection point matters more than the delivery channel. Any surface that can deliver a link can deliver a fake sign-in page, including calendar invitations, shared documents, SMS and voice callbacks. Stolen credentials were the way in for 13% of breaches in the 2026 Verizon DBIR (p. 15), and credential data appeared in 28% of them (p. 38). Awareness content and phishing simulations that only cover email leave those other doors open.

The Widespread Impact of Credential Harvesting

Credential harvesting serves as a gateway to various cyberattacks, including:

• Credential Stuffing: Automated use of stolen credentials across multiple accounts or platforms to gain unauthorized access.
• Advanced Persistent Threats (APTs): Long-term operations where attackers slowly gather sensitive information over extended periods.
• Business Email Compromise (BEC): Attackers use stolen credentials to impersonate employees or executives, leading to fraudulent financial transactions or data leaks.
• Global Phishing Campaigns: These campaigns exploit stolen credentials to bypass even advanced security measures like multi-factor authentication (MFA).
• State-Sponsored Attacks: Some attacks are orchestrated by nation-states to target government agencies, corporations, and research institutions for intelligence and sabotage.

These incidents demonstrate the extensive damage credential harvesting can inflict across industries, from financial losses to reputational harm.

Why Is Credential Harvesting on the Rise?

Stolen credentials are increasingly valuable in the cybercriminal ecosystem. They offer attackers a reliable way to bypass traditional security measures by masquerading as legitimate users. The simplicity and effectiveness of credential harvesting have made it one of the most favored methods in cyberattacks, particularly as businesses rely heavily on digital tools and online services.

Strategies to Prevent Credential Harvesting

Protecting your organization from credential harvesting requires a proactive approach, combining strong security measures with employee education. Let’s dive into key strategies further.

1. Employee Awareness and Training

Educating employees is one of the most effective ways to reduce the risk of credential harvesting. Security awareness training equips employees to identify phishing and other malicious activities. Simulations, such as the Keepnet Email Threat Simulator, allow employees to practice responding to mock cyberattacks.

2. Deploy Robust Email Security

Implementing advanced email security systems helps block phishing attempts, malicious attachments, and fraudulent links before they reach users.

3. Insider Threat Monitoring

Insider threat programs track unusual activity, such as unauthorized access attempts, and can alert security teams before significant breaches occur.

4. Multi-Factor Authentication (MFA)

Adding layers of authentication beyond passwords, such as biometrics or one-time passcodes, greatly reduces the likelihood of attackers successfully exploiting stolen credentials.

5. Comprehensive Risk Management Tools

Solutions like the Keepnet Human Risk Management Platform provide organizations with tools to measure and mitigate human-related risks effectively.

Defending Against Credential Harvesting with Keepnet

Credential harvesting is a growing threat, but organizations can safeguard their systems through a combination of education, technology, and strategy:

• The Keepnet Security Awareness Training program helps employees identify threats and avoid common pitfalls like phishing attacks.
• Tools like the Keepnet Phishing Simulator enable hands-on training to boost employee preparedness.
• The Keepnet Human Risk Management Platform provides holistic oversight of your organization's security posture.

By integrating these solutions, you can strengthen your defenses and minimize the risks associated with credential harvesting.

Editor's Note: This article was updated on March 12, 2026.

What This Means for Teams in 2026

Credential Harvesting? Protect Your Organization is most useful when it helps teams make better day-to-day decisions. The strongest content does more than explain a concept. It shows where risk appears in real work, which actions matter first, and how teams can reduce confusion when the pressure is high.

That is why practical structure matters. A short explanation, a clear response path, and a few repeatable habits usually create more value than broad advice that looks complete but is hard to use.

Keepnet teams usually see stronger results when content like this is tied to a clear workflow, owner, and reporting path. A common mistake is treating credential harvesting? protect your organization as background knowledge instead of a decision that shows up in real operations.

Keepnet Recommendation

• Translate the concept into a small set of practical decisions users can apply quickly.
• Focus on the workflows where the issue creates the most business exposure.
• Add reporting and escalation guidance so people know what to do under pressure.
• Review the content regularly so examples and priorities stay current.