Security issues: common threats and how to prevent them

Key takeaways

• Security issues often start with weak software, poor configuration, outdated systems, or human error.
• Common security issues include phishing, ransomware, unpatched software, and misconfigured environments.
• These problems can lead to data breaches, downtime, financial loss, and reputational damage.
• The best defense is layered security built on authentication, patching, monitoring, backups, and training.

Any website or online application, whether it’s an Internet bank processing millions of dollars in transactions daily or a storefront for small neighborhood businesses, can fall victim to malicious attacks and Internet security issues. Hackers often choose their targets by vulnerability, not by size or notoriety. Smaller systems, which may not even contain sensitive data, can be more tempting targets simply because they are easier to hack.

Some may view website security as a single protective shell around a site and server, which can be strengthened or weakened. A more accurate perspective is that every cyber security measure is a layer of protection. Each layer you add keeps your data safer. Many layers will be redundant, and this is good.

Security issues are not just technical flaws in code. They can come from outdated software, weak passwords, bad configurations, poor processes, and simple human mistakes. The goal is not to find one magic fix. It is to reduce risk across every layer of your environment and be ready when one of those layers fails.

What are security issues?

A security issue is any unmitigated risk or vulnerability in your system that hackers can use to do damage to systems or data. This includes vulnerabilities in the servers and software connecting your business to customers, as well as your business processes and people. 

That broad definition matters. Security issues are not limited to malware or obvious attacks. A reused password, an unpatched plugin, an exposed admin panel, or an employee who clicks the wrong link can all create the opening an attacker needs.

A vulnerability that hasn’t been exploited is simply a vulnerability that hasn’t been exploited yet. Web security problems should be addressed as soon as they are discovered, and effort should be put into finding them because exploitation attempts are inevitable. 

Why security issues matter

Security issues can affect far more than one page or one login. If the wrong vulnerability is exploited, the damage can spread quickly across your site, server, data, and business operations.

Data breaches

A data breach occurs whenever an unauthorized user gains access to your private data. That may include customer records, payment information, credentials, internal documents, or proprietary business data. In some cases, the attacker may only view the data. In others, they may copy, alter, or publish it.

Operational disruption

Some attacks are designed to steal. Others are designed to stop your business from functioning. Ransomware can lock files and systems. DDoS attacks can make a site unreachable. Malware can damage workstations, applications, and servers. Even a short disruption can create major problems if your site handles orders, customer communication, or critical workflows.

Financial and reputational loss

Security issues can lead to direct costs, such as recovery work, service restoration, and possible legal or regulatory consequences. Just as damaging, they can erode trust. If customers no longer believe their data is safe with you, rebuilding that confidence can take far longer than fixing the original problem.

The most common security issues

Here are the most common security issues businesses and website owners need to understand and prepare for.

1. Ransomware attacks

The goal of a ransomware attack is to gain exclusive control of critical data. The attacker encrypts your files and demands payment in exchange for the key needed to unlock them. In some cases, the attacker may also threaten to release sensitive data publicly if the ransom is not paid.

How to prevent it: The most effective ransomware protection starts with thorough, frequent backups stored in a safe location. If an attacker cannot hold your only copy hostage, they lose much of their leverage. Strong endpoint protection, limited access privileges, regular patching, and good user training also help reduce risk.

2. Code injection and remote code execution

To attempt a code injection, an attacker will search for places your application accepts user input; such as a contact form, data-entry field, or search box. If input is not validated properly, the attacker may be able to inject malicious commands, manipulate queries, or execute code on the system.

How to prevent it: Keep your CMS, framework, and application stack updated with security patches. Follow development best practices around input sanitization and validation. No matter how insignificant, all user input should be checked against a basic set of rules for what input is expected. A WAF and other server-level protections can also help catch known malicious requests before they reach the application.

3. Cross-site scripting (XSS)

JavaScript and other browser-side scripting methods are commonly used to dynamically update page content with external information such as a social media feed, current market information, or revenue-generating advertisements. That flexibility is useful, but it can also create risk.

Hackers use XSS to attack your customers by using your site as a vehicle to distribute malware or unsolicited advertisements. As a result, your company’s reputation can be tarnished, and you can lose customer trust. 

How to prevent it: Set strict content security policies, limit remote script sources, and escape user input properly. Small preventative measures can provide a lot of safety. 

4. Data breaches

A data breach occurs whenever an unauthorized user gains access to your private data. You may not even know there’s a breach immediately. For example, the attacker may have an administrative account password but hasn’t used it to make any changes yet. 

How to prevent it: Early detection matters. Monitor for unusual logins, file changes, new accounts, and unfamiliar access patterns. The more visibility you have into login activity and changes across your systems, the better your options are for cleanup and prevention.

5. Malware and virus infections

Malware is short for malicious software. It can encrypt data, log keystrokes, open backdoors, or help attackers spread from one compromised system to another. If malware is present, you’ve already been breached. 

How to prevent it: Be careful about downloads, use antivirus and malware scanning tools, and keep them updated. On the server side, use file monitoring, intrusion detection, vulnerability scanning, and good access controls. Just as important, determine which security issue led to the breach before cleanup or restoration begins. 

6. DDoS attacks

Distributed Denial of Service (DDoS) attacks are generally not attempting to gain access. Instead, they overwhelm a site, service, or application with more traffic than it can handle. That can make the site unreachable, slow down systems, and make investigation harder when combined with other attacks.

How to prevent it: Blocking such an attack can be nearly impossible by conventional means. The most effective measures usually involve DDoS protection services and enough server and network resources to absorb or isolate the traffic until the attack subsides.

7. Credential stuffing

Credential stuffing is a common term we now give to hackers abusing the re-use of passwords across multiple accounts. If an attacker gets one username and password combination, they will often try it across many other services.

How to prevent it: Never use the same password twice. Multi-factor authentication also helps prevent this by keeping the login secure even if the primary password is weak. 

8. Brute force attacks

In a brute force attack, the hacker tries multiple password guesses in various combinations until one is successful. These attacks are often automated and can continue for long periods if there is no rate limiting or login protection in place.

How to prevent it: Use systems or plugins that monitor repeated login failures and limit the number of guesses allowed. Combined with MFA, lockouts, IP blocking, and strong password policies, this makes brute force attacks far less effective.

9. Weak passwords and authentication issues

A chain is only as strong as its weakest link, and a computer system is only as secure as its weakest password. Weak passwords, reused passwords, shared credentials, and poor access controls make it much easier for attackers to gain entry.

A strong password should include 18 characters minimum, and the longer, the better. Password length increases security more than complexity. 

How to prevent it: Use two-factor authentication wherever available. Change passwords regularly, avoid reusing them across services, review permissions often, and remove unnecessary account access. Authentication should be treated as a major security layer, not just a login convenience.

10. Social engineering

Social engineering encompasses all of the non-technical ways an attacker may use to gain access or do damage to your systems or data.  The most common method is the oldest: lying or using fabricated information to gain trust. 

Attackers may impersonate a bank, a customer, a service provider, or even someone from inside your organization. The goal is usually to obtain sensitive information or persuade someone to perform a harmful action.

How to prevent it: Watch for red flags like urgency, threats, pressure, aggressive language, and evasive behavior when identity-verification questions are asked. Most importantly, build verification habits into your process. Do not rely on your ability to judge character. 

11. Spam and phishing

Spam, or unsolicited email messages, has been a headache for decades.  Phishing is more dangerous because it is designed to trick users into clicking malicious links, opening unsafe attachments, or entering credentials into fake login pages.

In spear-phishing attacks, staff may receive fake notifications from internal systems, with links crafted to capture logins to those systems. Attackers may also focus on one executive or administrator in a more targeted “whaling” attempt.

How to prevent it: Trust no incoming messages by default. Use strong passwords, secure email platforms, CAPTCHA on forms, and verification steps for any message that prompts action. Do not click login links in email messages. Open the website manually or by bookmark instead. 

12. Insider threats

Betrayal from the inside can harm your company on multiple levels. A trusted employee or contractor can damage your systems, steal confidential information, and even sabotage team unity. Not every insider threat is malicious, either. Some are the result of poor habits, excessive permissions, or careless mistakes.

How to prevent it: Only grant the minimum level of access necessary for each role. Avoid shared logins. Create individual accounts with appropriate permissions, and disable them when they are no longer needed. Accountability and least-privilege access are critical.

13. Sensitive data leaks

Data leaks can involve customer data or confidential intellectual property like source code. In many cases, the data itself was well protected, but another weakness, such as phishing, an insider threat, or poor access control, made the leak possible.

How to prevent it: Keep private data behind network security and login restrictions. Limit the number of users authorized for access. Ensure that all access is protected with strong passwords and multi-factor authentication wherever possible. 

14. No backups

As we covered earlier, we add layers of security, assuming that previous layers will someday fail. That makes backups essential. If a system is lost, encrypted, corrupted, or compromised, good backups give you a path to recovery.

The best recovery plans always begin with thorough, regular backups and adequate backup retention policies. 

How to prevent it: Focus on three backup best practices: scope, scheduling, and retention. Back up everything you cannot afford to lose, run backups often enough to capture meaningful changes, and keep enough historical versions to recover from compromises that go unnoticed for days. 

15. Not updating or patching regularly

While unpatched systems are perhaps the easiest security issue to avoid, they are also one of the most commonly exploited. Nearly every software update contains at least a few security patches for known vulnerabilities. 

Many CMS installations are rarely, if ever, updated after deployment. That leaves old vulnerabilities exposed long after attackers have learned how to exploit them.

How to prevent it: Keep all components updated to their latest supported release. Development sites are just as important to update as live production sites. Attackers do not care whether a site is active, abandoned, or internal. They only care whether it is vulnerable. 

Security issues by attack surface

Security issues become easier to understand when you group them by where they tend to appear.

Website and application security issues

These include code injection, XSS, outdated plugins, insecure forms, poor input validation, and vulnerable themes or extensions. They often begin in the application layer but can lead to much broader compromise.

Server and infrastructure security issues

These include open ports, weak segmentation, poor server hardening, outdated services, insufficient monitoring, and exposed administrative interfaces. Infrastructure-level mistakes can turn a small flaw into a major incident.

User and authentication security issues

Weak passwords, no MFA, credential reuse, shared accounts, excessive privileges, and poor user verification all fall into this category. Authentication weaknesses deserve special attention because they often turn one leaked credential into a full compromise.

Cloud and remote access security issues

Misconfigured storage, overly permissive cloud access, insecure remote devices, and weak VPN setups create additional risk. The more distributed your environment becomes, the more important it is to review trust boundaries carefully.

What causes security issues?

Security issues do not usually come from one single source. They tend to grow from a mix of technical weaknesses, process failures, and human decisions.

• Software flaws and vulnerabilities: No software is perfect. New vulnerabilities are discovered constantly, which is why patching and update discipline matter so much.
• Human error and poor security awareness: A rushed click, reused password, exposed credential, or mistaken permission change can create an opening just as easily as a code flaw.
• Misconfiguration and weak setup decisions: Poor defaults, open services, insecure APIs, weak access controls, and exposed storage are some of the most common real-world causes of security problems.
• Delayed patching and maintenance gaps: Many environments are compromised not because the attack was sophisticated, but because the known fix was never applied.
• Too much trust in a single control: It may seem counterintuitive or paranoid, but the best approach when securing your site is to assume each layer will fail. For example, two-factor authentication adds a second layer of authentication under the assumption that the primary password will one day be stolen. 

How to prevent security issues

The most effective prevention strategy is layered security. No single tool, policy, or product can cover every weakness.

Use layered security

Every cyber security measure is a layer of protection. Each layer you add keeps your data safer. Many layers will be redundant, and this is good. Defense in depth works because attackers do not need every layer to fail. They only need one. Your goal is to make that one failure harder to find and less damaging if it happens.

Strengthen authentication

Use MFA wherever possible. Require long, unique passwords, limit account privileges, review dormant accounts, and stop sharing credentials. Authentication should be treated as a core control, especially for administrators, developers, billing users, and anyone with access to customer or server data.

Keep systems patched

Update your CMS, themes, plugins, operating systems, libraries, frameworks, and server software regularly. Include test environments, staging sites, and abandoned projects in that review process. 

Train employees continuously

Many of the most dangerous attacks still depend on human behavior. Train staff to spot phishing attempts, verify unexpected requests, avoid unsafe attachments, and follow secure workflows for access and approvals.

Monitor systems and detect threats early

Use login monitoring, file change detection, malware scanning, vulnerability assessments, logging, and alerting. Early detection gives you the best options for cleanup and prevention. 

Back up data and prepare for recovery

Prevention and recovery should work together. Backups, disaster recovery plans, and tested restoration workflows make security more resilient because they assume that something will eventually go wrong.

Use infrastructure protections

A strong security posture also depends on infrastructure controls such as WAFs, DDoS protection, secure email filtering, VPNs, hardened server configurations, and managed security tooling.

Why layered security matters

The layered model is one of the most useful ways to think about security issues.

First, every security layer can fail; passwords are stolen, users make mistakes, software bugs are found, and servers are misconfigured. If your strategy depends on one control being perfect forever, it is not a strong strategy.

Second, security is about people, process, and technology. A well-configured server can still be exposed by a phishing attack. A strong backup plan can still fail if it is never tested. A secure login process can still be bypassed if one shared admin password is used everywhere.

Third, prevention and recovery should work together. Security is stronger when scanning, monitoring, access control, backups, patching, and incident response all support one another.

Security issues for websites and web applications

For website owners, developers, and ecommerce teams, some security issues matter more often than others.

Common website security issues

Outdated CMS software, insecure plugins, exposed admin panels, weak credentials, vulnerable forms, code injection, and malware are some of the most common problems. Websites are frequent targets because they are public-facing and often run on stacks with many moving parts.

Ecommerce and customer-data risk

Online stores face higher stakes because they often handle payment workflows, customer accounts, and personal data. A security issue in an ecommerce environment can affect revenue, trust, and compliance all at once.

Why hosting and infrastructure matter

Application security matters, but infrastructure matters too. The wrong server configuration, weak monitoring, missing DDoS protection, or poor backup posture can make a manageable issue much worse. Good hosting should support layered security, not leave it entirely to the site owner.

A practical checklist for reducing security issues

1. Turn on MFA for all critical accounts.
2. Update your CMS, plugins, themes, and server software.
3. Review permissions and remove unnecessary access.
4. Scan for misconfigurations and exposed services.
5. Train employees on phishing and account security.
6. Verify your backups and recovery workflows.
7. Monitor logs, alerts, file changes, and suspicious activity regularly.

Security issue FAQs

Next steps for security issues

Security issues are not limited to one kind of attack or one weak point. They can come from code flaws, weak passwords, human error, bad configurations, missing backups, and outdated systems. The most effective defense is a layered one that assumes controls can fail and prepares accordingly.

A good next step is to review your environment for the basics first: MFA, patching, backups, login monitoring, and access control. Once those foundations are in place, explore Liquid Web’s hosting solutions to see how stronger infrastructure, backup options, and security-focused features can help support a more resilient website environment.