How Tailgating Happens in Office Buildings

How Tailgating Happens in Office Buildings

Tailgating (also called piggybacking) is the act of following an authorised person through a secured door without presenting credentials. It is one of the most common and underestimated physical security breaches in modern workplaces.

The Typical Scenario

An attacker arrives at a secure entrance carrying boxes or coffee cups, making it socially awkward for the person ahead to let the door close. The authorised employee holds the door open out of politeness — and the attacker is inside.

Why People Allow It

Holding a door for someone feels polite and natural. Challenging a stranger feels confrontational and rude. Attackers exploit this social norm deliberately, often dressing in uniforms, carrying props, or timing their approach to coincide with busy periods.

The Consequences

Once inside, an attacker can access server rooms, steal hardware, plant listening devices, access unattended workstations, or simply observe sensitive information on screens and whiteboards.

Prevention Measures

• Mantrap / airlock entries: Two-door systems that prevent a second person entering until the first has authenticated.
• Security awareness training: Teach staff that it is acceptable — and expected — to challenge unfamiliar individuals.
• Visitor management systems: All visitors should be signed in, badged, and escorted.
• Access control audits: Review door logs regularly for anomalous entry patterns.
• Clear signage: Remind staff that tailgating is a security violation, not a social faux pas.