The small security gaps that attackers look for first

Cyberattacks often start with something mundane, an outdated app on a workstation, an administrator account no one remembered, or a reused password scribbled on a sticky note. The small oversights are the footholds attackers use to spread across a network, steal information, and disrupt care.

The FBI’s 2024 Internet Crime Report noted that health care suffered the highest combined total of ransomware and data theft attacks among US critical infrastructure sectors. In the AHA press release, John Riggi, AHA national advisor for cybersecurity and risk, stated, “As we analyze these incidents, we have noticed consistent patterns over the past three years, with the vast majority of patient records being stolen from third parties—not from hospitals.” Investigators found that most patient records were not stolen through direct hacks of hospital networks but through third-party vendors, using social-engineering tricks, stolen credentials, and unpatched vulnerabilities.

Why attackers look for easy openings first

Well-funded ransomware groups may be able to design sophisticated malware, but they often use the simplest methods to deliver it, like public-facing systems that have not been updated. Healthcare organizations use countless devices, applications, and service providers, leading to an ever-growing attack surface. John Riggi stated that most ransomware attacks against the sector depend on social engineering, stolen credentials, and exploiting unpatched vulnerabilities. Cybercriminals love these easy tricks because they require little effort and are successful.

It is evident in the increase in incidents in recent years. Health-ISAC reported a 55% increase in cyber incidents across sectors in 2025, with hundreds of alerts relating to open databases, exposed remote-access tools, and remote code-execution vulnerabilities. Attackers know that many health systems still run legacy software and internet-connected devices that are hard to support. They look for those soft spots and attempt easy methods to enter. Once inside, they move fast before defenders know, often pivoting through multiple systems.

The most common weak points attackers notice first

Weak or reused passwords

Passwords remain the first line of defense for most applications, yet they are often the weakest link. Studies of hospital password practices showed that staff commonly choose short or easy-to-remember passwords or reuse the same credentials across multiple systems.

One assessment of patient portal security indexed in DovePress noted that both system administrators and patients used common passwords that could be guessed or brute‑forced. When one credential is compromised, attackers can move from one account to another quickly, escalating their access.

Unpatched software

Software vendors routinely release security patches to fix newly discovered flaws, yet many organizations delay installing them. Health Care Cybersecurity Challenges and Solutions Under the Climate of COVID-19: Scoping Review offers that during the COVID‑19 pandemic, healthcare providers turned to telehealth and remote work, often using older versions of Windows and remote desktop protocols without timely updates. Researchers noted that unpatched devices and unsecured remote‑access services made it easier for ransomware gangs to deploy malware or pivot into hospital networks.

Attackers know that unpatched systems are a goldmine. In January 2025, the AHA issued an advisory about vulnerabilities in SimpleHelp remote‑monitoring software. Patches had been released on January 13, yet threat actors exploited the flaws within a week to gain unauthorized access to private networks.

Forgotten accounts

Every user account represents a potential opening into a system. When employees leave, vendors finish projects, or devices are retired, their accounts and access privileges should be removed. In practice, old accounts often linger. A Microprocessors and Microsystems review of cyber‑physical systems security recommended it is “essential to set the right privileges (task-based, role-based, rule-based, etc..) and strong password complexity policies in order to enhance the security level.

Managing accounts is an ongoing process, not a one‑time cleanup. Periodic audits should compare the list of active users against employment records and vendor contracts. Privileged accounts, those with administrator or system‑wide rights, should be limited and regularly reviewed. Termination and off‑boarding procedures must include disabling accounts and reclaiming credentials.

Exposed devices and systems

Healthcare networks are full of devices beyond desktops and laptops: imaging equipment, infusion pumps, printers, routers, and servers. Many of these systems are internet‑connected or remotely managed, yet they are rarely hardened. A 2026 analysis of FDA safety communications found that 94% of reported medical device vulnerabilities were classified as high‑risk, exposing patients to unauthorized remote access and possible device malfunction or data breaches. The study emphasized that IoT and remote monitoring technologies have improved patient care but introduced serious cybersecurity risks.

Threat intelligence updates show how misconfigurations turn into attack vectors. Health‑ISAC alerts in late 2025 warned members about open databases, exposed remote‑access tools, and remote code‑execution bugs in Windows Server Update Services. These issues often arise when devices are deployed with default settings or when administrators enable remote access for convenience. Criminals have also exploited patched vulnerabilities in remote monitoring software to gain administrative privileges.

Email gaps

Email remains one of the simplest paths into an organization. Busy clinicians and staff handle hundreds of messages a day, making it easy to click a malicious link or open an attachment without noticing suspicious signs. An analysis of electronic health record breaches found that phishing scams compromised more records than any other cause. According to Human Factors in Electronic Health Records Cybersecurity Breach: An Exploratory Analysis noted in 2015, a spear-phishing campaign at Anthem Inc. led to the theft of 78.8 million patient records; attackers used stolen credentials from a single email to query a database and exfiltrate large volumes of data.

Phishing campaigns continue to evolve, as seen in May 2026, Microsoft warned of a large‑scale, multistage phishing campaign that sent code of conduct themed emails to more than 35,000 users across 13,000 organizations, disproportionately targeting health care. The attackers used adversary‑in‑the‑middle techniques to intercept authentication tokens and bypass MFA. Scott Gee, the AHA’s deputy national director for cybersecurity, stated in the AHA press release on the attack that training and vigilance are needed as phishing remains the most effective method of attacking the sector.

Why email access represents a weak point and how to secure it

Email accounts often act as skeleton keys. Many web services use email addresses for password resets and multifactor prompts; if an attacker controls your inbox, they can reset other accounts and bypass security questions. The Microsoft‑identified phishing campaign shows how attackers now intercept authentication tokens to hijack sessions.

In addition, stolen email accounts can be used to send convincing messages to colleagues and business partners, spreading malware deeper into an organization. For this reason, Paubox is the best solution. Its generative AI feature allows for security to evolve continuously adapting to newer threats as they arise.

See also: HIPAA Compliant Email: The Definitive Guide (2026 Update)

FAQs

Why is email access so valuable to attackers?

Email often connects to everything else a person uses at work. Once an attacker controls an inbox, they may be able to reset passwords, read internal conversations, find vendor contacts, impersonate employees, and look for sensitive attachments.

What does it mean to call email a skeleton key?

It means email can unlock access to other systems. Many apps, portals, cloud tools, and vendor platforms use email for password resets, alerts, approvals, and account recovery, so one compromised inbox can lead to several other compromises.

How can one stolen email password lead to a bigger breach?

An attacker can use the stolen password to log in, search the inbox for useful information, reset connected accounts, send convincing messages to coworkers, and move into other systems.