Listing Hijacking
Quick answer
When an unauthorized seller attaches to a brand's existing marketplace listing — typically on Amazon — to sell counterfeit or gray-market versions under the brand's own product page.
Hijackers exploit Amazon's shared-listing model to inherit the brand's reviews and search rank while undercutting on price to win the buy box. Defenses include Brand Registry complaints, test buys proving inauthenticity, and Transparency serialization.