Healthcare email security failures still exist, despite confidence

Email remains the backbone of communication in healthcare, yet research from Paubox shows the sector still struggles to secure it. Surveys, breach analysis, and technical investigations across multiple Paubox reports show that many healthcare organizations believe their defenses are strong, even as cyberattacks, configuration errors, and compliance gaps continue to expose sensitive patient data known as protected health information (PHI).

Email threats and system vulnerabilities in healthcare

Healthcare organizations are experiencing email security failures

Recent survey data suggests many healthcare providers recognize weaknesses in their email defenses. The Paubox IT survey found that “60% of healthcare orgs admit email security failure,” pointing to ongoing challenges in protecting inboxes that contain patient information. Email sits at the center of healthcare operations, supporting appointment scheduling, lab coordination, patient inquiries, billing inquiries, and administrative communication, making it a valuable target for attackers seeking to monitor conversations, steal sensitive data, or impersonate trusted staff. Findings from the Paubox 2025 Healthcare Email Security Report add further context, noting that “email remains the number one attack vector for healthcare breaches,” indicating that even well-resourced healthcare organizations continue to struggle with securing routine communications.

Breach data shows email exposure is continuing to grow

Breach reporting data shows that email incidents remain a major source of healthcare data exposure. According to research from Paubox, “In 2024 alone, 180 healthcare organizations reported email-related breaches.” Healthcare email systems often store large volumes of sensitive information such as patient histories, insurance records, prescriptions, and billing data. Once attackers gain access to an account using stolen credentials, they can quietly monitor conversations or download attachments without triggering traditional malware detection tools, allowing these intrusions to persist undetected for long periods.

Read also: What is malware?

Cloud email platforms introduce additional risk if misconfigured

Many healthcare organizations rely on large cloud email platforms such as Microsoft 365 and Google Workspace to manage communication. While these services provide strong infrastructure, they are not automatically configured to meet healthcare compliance requirements. Misconfigured sharing permissions, incomplete encryption settings, and weak authentication controls can leave protected health information, or PHI, exposed even within otherwise secure systems. Research from Paubox warns that mismanagement of these tools can place sensitive data at risk. The problem often stems from complexity rather than malicious intent, as cloud email platforms include many configuration options, and small setup errors can unintentionally expose sensitive information if organizations assume default settings meet regulatory expectations.

Microsoft 365 breaches show how common cloud email exposure has become

Cloud platforms play a big part in healthcare email systems, which is why they often appear in breach investigations. Research from Paubox found that “43.3% of email-related breaches in 2024 occurred on Microsoft 365.” The figure does not necessarily point to a flaw in Microsoft 365 itself, however it shows how widely the platform is used across healthcare organizations. When millions of healthcare workers rely on the same system, attackers tend to focus their efforts there, making proper configuration and monitoring by organizations a huge part of security.

Email security posture remains weak across the industry

When researchers reviewed the overall security posture of healthcare organizations, the results suggested that strong protections remain rare. The Paubox healthcare security report found that “only 1.1% of healthcare organizations had a low-risk email security posture.” In practice, that means most organizations still operate with some level of exposure in their email systems, often caused by issues such as misconfigured authentication tools that verify senders, limited monitoring of suspicious activity, weak password practices, or insufficient staff training. Together, these gaps create opportunities for attackers to gain access to healthcare email environments.

Operational and human factors behind healthcare email risk

Healthcare IT teams often believe they are more protected than they actually are

One of the more notable findings from research by Paubox points to a gap between perception and reality in healthcare email security. Surveys suggest many healthcare IT leaders believe their organizations are well protected from email threats, yet deeper analysis indicates those protections often contain weaknesses. Researchers warn that healthcare IT departments may be “dangerously overconfident about email security,” especially when relying on default system settings or basic security tools. Even organizations that invest in cybersecurity software can remain exposed if systems are not properly configured or monitored. As the Paubox report explains, “investing in cybersecurity tools is not enough,” since effective security also requires ongoing oversight, configuration management, and user awareness.

Small practices often misunderstand HIPAA email requirements

Research also shows that smaller healthcare organizations often misunderstand what Health Insurance Portability and Accountability Act compliance requires. Many clinics assume that simply turning on email encryption is enough to meet the law’s security standards. In practice, HIPAA expects a broader set of safeguards, including access controls, user authentication, activity monitoring, and regular risk analysis. Focusing only on encryption can leave gaps where sensitive patient information is still exposed through misconfigured systems or compromised accounts. Research from Paubox notes that routine email practices such as forwarding rules, shared inboxes, and third-party integrations can introduce additional exposure if they are not properly monitored.

Learn more: What small healthcare practices get wrong about HIPAA and email security

Rural healthcare providers face additional cybersecurity pressure

Healthcare email security risks can be even greater for smaller or rural providers, which often operate with limited IT staff, smaller cybersecurity budgets, and fewer advanced monitoring tools. Despite these constraints, rural clinics and smaller healthcare organizations handle the same types of sensitive patient information as large hospital systems. A cyberattack targeting email systems can disrupt operations, delay care delivery, and expose protected health information. Email security, therefore, affects both patient privacy and patient safety, because attackers who gain access to clinical communication channels may interfere with how care is coordinated or delivered.

See more: Rural Healthcare left vulnerable to cyber attacks

Human reporting gaps allow phishing to persist

Even when employees receive cybersecurity training, reporting suspicious emails remains inconsistent. The Paubox Healthcare Email Security Report notes that “only 5% of phishing attacks are reported by employees.” That gap means many phishing attempts never reach security teams, reducing the chance to identify patterns or block similar messages before they spread across an organization. Since phishing campaigns often rely on social engineering, which means manipulating people rather than exploiting software vulnerabilities, employee awareness and reporting are still required for early detection.

What the research suggests about healthcare cybersecurity

Findings from multiple reports by Paubox point to a consistent issue across healthcare organizations: email is imperative for daily operations, yet security protections have not always kept pace with changing threats. Attackers continue to rely on familiar tactics such as phishing, credential theft, and impersonation because they remain effective, while cloud services, third-party integrations, and human error add further complexity for security teams. The research indicates that protecting healthcare email requires more than basic spam filtering or encryption. Measures such as strong authentication, continuous monitoring, employee training, and proper cloud configuration all help reduce exposure. Without these safeguards, healthcare organizations risk repeating the same pattern seen in recent breach data, where widely used email systems remain difficult to fully secure.

FAQs

Why is email such a common entry point for healthcare cyberattacks?

Email systems store large volumes of sensitive data and are used constantly by staff. The Paubox report notes that “email remains the number one attack vector for healthcare breaches.”

How many healthcare breaches involve email systems?

Paubox research found that “in 2024 alone, 180 healthcare organizations reported email-related breaches.”

Why do phishing attacks still succeed even with security training?

Human behavior remains difficult to predict. According to the report, “only 5% of phishing attacks are reported by employees,” meaning many suspicious emails go unflagged.

Are cloud email platforms a major source of breaches?

Cloud platforms appear frequently in breach investigations because of their widespread use. Research found “43.3% of email-related breaches in 2024 occurred on Microsoft 365.”

How strong is healthcare’s overall email security posture?

The Paubox Healthcare Email Security Report states that “only 1.1% of healthcare organizations had a low-risk email security posture,” suggesting most organizations still have security gaps.