PurposeCorporate brands increasingly use influential, high reach human brands (e.g. influencers, celebrities), who have strong parasocial relationships with their followers and audiences, to promote their offerings. However, despite emerging understanding of the benefits arising from human brand-based campaigns, knowledge about their potentially negative effects on the corporate brand remains limited. Addressing this gap, this paper deepens insight into the potential risk human brands pose to corporate brands.Design/methodology/approachTo explore these issues, this conceptual paper reviews and integrates literature on consumer brand engagement, human brands, brand hijacking and parasocial relationships.FindingsThough consumers' favorable human brand associations can be used to improve corporate brand outcomes, they rely on consumers' relationship with the endorsing human brand. Given the dependency of these brands, human brand-based marketing bears the risk that the human brand (vs the firm) “owns” the consumer's corporate brand relationship, which the authors coin relationship hijacking. This phenomenon can severely impair consumers' engagement and relationship with the corporate brand.Originality/valueThis paper sheds light on the role of human brands in strategic brand management. Though prior research has highlighted the positive outcomes accruing to the use of human brands, the authors identify its potential dark sides, thus exposing pivotal insight.