Here are a few examples of usage.
In Australia, the phrase is used when speaking about how modernization threatens to change the way of life of Aborigines. In China, political officials have employed the phrase as policy to guard against the "negative" influence of foreign pop culture. In Africa, leaders have applied the phrase in voicing concerns over the impact of development on local traditions.

There seems to be a common thread in meaning that "cultural security" is the challenge of preserving cultural identity in the face of modernization and globalization.
But it's no longer quite that neatly defined.
In some cases, property and traditions are deliberately targeted with the intent of undermining or even eliminating a culture. In World War II, Nazi destruction of Slavic heritage and illicit acquisition of art from Jewish collectors are poignant examples. More recently, the demolition of the giant statues of Buddha in the Bamiyan Valley of Afghanistan terrorized locals and shocked the world as did the destruction of Sufi shrines in Timbuktu, Mali. In each case, the destruction of cultural property was related to violence against an ethnicity or religion. In each case, the targeted destruction undermined a sense of security.

The expanding meaning of the phrase suggests that culture will play an increasingly important role in global politics, economics, and security.
What do you think "cultural security" will mean in the 21st century?