When we think of cybersecurity, most of us picture firewalls, passwords, and antivirus software. But sometimes, the biggest vulnerabilities aren’t digital at all—they’re physical.
Tailgating in cybersecurity refers to a physical breach where an unauthorised person gains entry to a secure area by following closely behind someone with legitimate access.
Despite advances in digital defences, tailgating remains a significant threat because it exploits human behaviour and overlooked physical security gaps.
Often considered a form of social engineering, tailgating reminds us that strong cybersecurity must also include robust physical access control.
What is Tailgating in Cyber Security?
Tailgating occurs when an unauthorised individual gains access to a restricted area by closely following an authorised person, often without the latter realising it.
Unlike hacking or phishing attacks, tailgating is a physical breach. It targets organisations’ human elements—like kindness or distraction—rather than attacking digital systems directly.
By gaining physical entry, attackers can steal sensitive information, insert malicious devices, or disrupt operations—all without needing to crack a password.
Tailgating Attacks vs. Piggybacking
While the terms tailgating and piggybacking are often used interchangeably, they have important distinctions:
| Aspect | Tailgating | Piggybacking |
| Definition | Unauthorised person sneaks in unnoticed. | Authorised person knowingly (but wrongly) allows another to enter. |
| Intent of Authorised Person | Unaware. | Aware and complicit (even if innocently). |
| Example | Someone slips in after an employee without permission. | An employee holds the door open for someone without verifying their credentials. |
Understanding the difference is key to training staff to recognise and prevent both types of attacks.
How Tailgating Works: Common Scenarios
The process generally involves:
- Observation: The attacker waits near a secure location or entry point to observe employee movements and find flaws.
- Behaviour Exploitation: They take advantage of an authorised person’s inclination to assist or ignore suspicious activity. For example, someone may hold the door open for a seemingly innocent stranger.
- Physical Access: Once inside, the unauthorised individual is free to wander about the facilities, potentially getting access to critical information or compromising security systems.
Tailgating exploits everyday workplace behaviours. Common scenarios include:
- Slipping Behind an Employee: An attacker casually follows a badge-carrying employee through a secure door without swiping a card themselves.
- Deliveries and Smoke Breaks: Attackers pose as couriers or take advantage of distracted employees during breaks to slip inside.
- Contractor or Cleaner Disguise: Wearing uniforms or carrying fake IDs, attackers impersonate contractors, cleaners, or maintenance workers to gain trust and access.
- Busy Entry Points: In crowded lobbies or cafeterias, attackers blend into groups entering en masse, bypassing individual checks.
These scenarios highlight why physical security awareness is just as crucial as strong passwords.
Why Tailgating is a Serious Threat
While it might seem harmless to “hold the door,” tailgating can have severe consequences:
- Access to Restricted Areas: Tailgaters circumvent security measures, obtaining access to areas where only permitted individuals should be. Once inside, they could move around unobserved, raising the possibility of theft, data breaches, or sabotage.
- Exposure to Sensitive Information: By entering a secure location, attackers can obtain access to sensitive information such as confidential employee data, financial records and intellectual property.
- Social Engineering Tactics: Tailgating attacks, which rely on human nature—such as courtesy or unwillingness to interrogate a stranger can go undetected even in organisations with advanced security measures.
- Potential for Harmful Acts: In some circumstances, an unauthorised user could use their access to commit physical harm, install malware, or disrupt key processes. Even a seemingly innocuous gesture of holding the door open can result in disastrous consequences.
No matter how strong your digital security is, one open door can bring it all undone.
Real-World Examples of Tailgating Incidents
While specific Australian examples are often underreported for security reasons, tailgating has played a role in major global breaches:
- Government Facilities: In several incidents overseas, unauthorised individuals accessed government data centres by posing as maintenance staff.
- Finance Sector: Tailgating has led to unauthorised access to server rooms in financial institutions, compromising sensitive customer data.
- Healthcare: Hospitals have seen breaches where tailgaters accessed patient records or planted malware, jeopardising both privacy and patient safety.
In Australia, sectors like healthcare and finance remain high-value targets. Incidents such as the recent unauthorised network access in 5 major superannuation funds underscore the need for vigilance—not only online but at the door.
Tailgating vs. Other Social Engineering Attacks
Tailgating is just one tactic in the broader world of social engineering. Here’s how it compares:
| Attack Type | Method | Goal |
| Tailgating | Physical intrusion by following authorised users. | Gain on-site access to systems/data. |
| Phishing | Deceptive emails or messages. | Steal credentials or install malware. |
| Baiting | Offering fake “free” devices or services. | Trick users into introducing malware. |
| Pretexting | Fabricated scenarios to gain trust. | Obtain sensitive information or access. |
Unlike digital-only attacks, tailgating combines psychology with physical action, making it harder to detect through traditional cybersecurity tools.
How to Prevent Tailgating in Your Organisation
An effective defence against tailgating requires a mix of physical controls, cybersecurity training for employees, and clear policies.
Physical Security Controls
- Key Cards, Turnstiles, and Mantraps: Limit access to one person per authorisation.
- Surveillance Systems: Install security cameras and monitor access logs regularly.
- Visitor Management Systems: Use electronic check-in/check-out processes.
Human Behavioural Training
- Educate Staff: Make employees aware that holding the door can be a serious risk.
- Promote a “Challenge Culture”: Encourage staff to politely question unknown individuals.
- Reinforce Visitor Policies: Train staff to escort all visitors, no exceptions.
Clear Protocols for Visitors and Contractors
- Pre-Approval and Escorting: Require prior registration for all external visitors.
- Badge Systems: Issue temporary badges that clearly identify non-employees.
- Access Restrictions: Limit visitor access to only necessary areas.
Technology Integration
- Smart Locks and Biometric Systems: Add layers of verification beyond standard keycards.
- Tailgating Detection Systems: Use sensors to detect when multiple individuals pass through security checkpoints without authorisation.
Creating a Tailgating Response Policy
Creating a IT policy for tailgating is important as it provides staff with knowledge on what to do in the event of, how to report it and a review process. Below is a basic policy template that can be used within your organisation:
Purpose
The rules in this policy are meant to keep driving attacks from happening in the company’s IT system. Tailgating, which is when someone who isn’t supposed to be there gets into sensitive security systems by lying or being careless, can cause security risks, data breaches, and the public seeing private information without permission.
Scope
This policy covers all employees, contractors, vendors, and guest visitors who are allowed to enter restricted areas of the company’s IT network. This includes physical entry points, cloud environments, and internal databases.
Statement of Policy
The company is dedicated to protecting its IT systems from tailgating threats. When employees log in to work computers, they have to follow strict security rules to make sure they are the right people and stop others from getting in without permission.
Procedures and Controls for Security
Measures to Control Access
- To get into company IT systems, all workers must use multi-factor authentication (MFA).
- You need a badge or biometric authentication to get into secure places with IT infrastructure.
- All systems have automatic session locking turned on to stop people from using them without permission.
- Visitors and workers must be given temporary login information that only lets them do certain things.
Training and Awareness for Employees:
- Employees will learn about tailgating attack risks through required cybersecurity training.
- Employees must report any strange behaviour, such as people trying to get into restricted places without permission.
- The staff should never hold the door open or give out login information to people who aren’t supposed to have it.
Security Protocols for Prevention
- Role-based access rules (RBAC) will make sure that only authorised people can get into important IT systems.
- Security measures for the network will keep track of logins and flag any strange trends of access.
- Employees shouldn’t leave their devices idle in public places so that people who aren’t supposed to be there can’t get into company networks.
- Strict rules for third-party access make sure that outside sellers follow safe authentication steps.
Compliance and Enforcement
Failure to comply with this policy may result in disciplinary action, including suspension of system access or termination. The IT department will monitor adherence and provide regular updates on evolving tailgating attack prevention strategies.
Final Thoughts
Tailgating remains one of the simplest yet most dangerous security risks.
It highlights a critical truth: cybersecurity isn’t just about protecting systems—it’s about protecting spaces.
By combining technology, training, and clear policies, businesses can build a layered defence against physical and digital threats alike.
A culture of security awareness at every door is essential for protecting sensitive information and maintaining trust.
At IT Networks, as a leading managed IT company in Australia, we offer tailored cybersecurity audits and managed IT security services that assess both your digital infrastructure and your physical access controls.
With offices in Melbourne and Perth, our IT security team is ready to help you strengthen your security posture from every angle.
Contact us today to learn how we can help protect your organisation against evolving threats.
