Consumers expect organizations to be socially responsible but, at the same time, have been shown to be skeptical of the motives behind corporate social responsibility (CSR) initiatives. This is because some organizations engage in CSR simply for the positive financial benefits (i.e., instrumental motive), rather than a genuine concern for society (i.e., moral motive). This has led to increased public scrutiny of the ethics of corporate executives. In this paper, we developed a theoretical model that links morally questionable CEO leadership ethics to consumer support of a firm’s CSR through the mediating effects of consumer CSR motive attributions and cynicism respectively. We proposed that media exposure to morally questionable CEO ethics encourages higher consumer attributions of instrumental motives and lower attributions of moral motives. In turn, these attributions affect consumer CSR financial donations, volunteering, and purchase intentions through the mediating effect of cynicism. In an experimental study of consumer media exposure to three types of CEOs (i.e., morally questionable, ethical, and ethics-unknown), we found empirical support for our model. The findings demonstrate that consumers consider CEO ethics in determining the sincerity of a CSR initiative and will shun an organization’s CSR if they perceive it to be purely instrumentally motivated.