- Poland's Border Guard identified 8,300 illegal foreign residents from January through August 2026, a 40% jump over the same period last year.
- Ukrainians and Colombians make up the largest shares of those detained, followed by Georgians, Belarusians and Moldovans.
- Experts warn Poland is entering a full-scale crisis as forged documents, informal rentals and shell companies let migrants operate outside the law.
- Unregistered foreigners pose added security risks, officials say, since they are harder to track and could be exploited for sabotage or other hostile activity.
- The overstay surge stands in sharp contrast to Poland's success sealing new Belarus border crossings, which collapsed from 15,500 to just 235 this year.
Poland's Border Guard has identified approximately 8,300 foreigners living illegally in the country between January and the end of August 2026, marking a roughly 40% increase from the approximately 6,000 detected during the same period last year. The sharp rise has prompted security experts to warn that Warsaw is entering what one professor called a "full-scale crisis" in managing foreign populations already inside its territory.
Ukrainians account for 2,200 of those detained, while Colombians represent 1,400, followed by Georgians at 748, Belarusians at 400, and Moldovans at 354, according to Major Anna Sobieska-Tekie?, spokesperson for Border Guard Headquarters. Many of these individuals lack documents permitting them to stay in Poland or have overstayed their legal residence periods.
Extensive shadow networks enable illegal work and housing
A sophisticated support infrastructure allows foreigners to operate outside Poland's legal framework, including forged visas and work permits, informal apartment rentals, and fictitious companies created specifically to obtain work visas for migrants, according to Polish news outlet Rzeczpospolita. Tomasz Safja?ski, a professor at WSB University in D?browa Górnicza and deputy director of the Center for Research on Cross-Border Security, warned that when a state controls its border but loses the ability to determine who remains after residence rights expire, a "security gap" emerges. Experts point to a growing shadow economy where illegal employment allows employers to avoid taxes and social-security contributions, while raising the risk of organized crime including human trafficking and document forgery.
Intelligence concerns grow over unmonitored foreign populations
People who remain outside Poland's official registration system pose particular security risks. Officials interviewed by Rzeczpospolita said such individuals are harder to track and could be exploited by foreign intelligence services to carry out sabotage or other hostile operations. The Polish Border Guard runs ongoing enforcement sweeps targeting people who have exceeded their permitted residence period, are working without the required permit, are using invalid documents, or were previously barred from Poland or other Schengen countries; officers also detain people who had earlier been ordered to leave the European Union.
Crackdown operations expand nationwide
In an earlier nationwide operation conducted March 2–3, Polish police and Border Guard deployed more than 26,000 officers in a two-day sweep targeting wanted foreign nationals. Interior Minister Marcin Kierwinski reported that 147 foreigners wanted by Polish law enforcement were detained, with 140 identified as staying illegally. Return proceedings were initiated against over 130 of those detained, with illegal stay cited as the reason in nearly 110 cases and national security threats cited in over 20 cases.
The largest groups checked were from Ukraine, Colombia, and Nepal. This marked the fourth such operation, following 2025 raids that detained 4,766 people including 515 foreigners. Between January 1 and March 1, Poland also transferred 33 foreigners back to Lithuania and 13 to Germany under readmission procedures.
The accelerating crisis underscores what security analysts describe as Poland's deteriorating ability to track and manage foreign populations already within its borders — a gap that stands in sharp contrast to Warsaw's success at sealing new entries. Attempted illegal crossings from Belarus collapsed from roughly 15,500 in the first half of 2025 to just 235 in the same period this year, according to Poland's Border Guard, after the country built a 5.5-meter steel fence and deployed thousands of additional troops along the frontier.
Without comparable resources devoted to interior enforcement, migrants who arrive through legal channels or slip through gaps in an overwhelmed visa and residency system appear increasingly free to vanish into the shadow economy once they are inside the country.
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