1. A system to verify publication data at a computer system, the system including: a server including one or more processors and a network interface communicatively coupled to a network, the server hosting an electronic commerce system, the electronic commerce system including: an interface module to receive the publication data, the publication data sent to the computer system to be published at a future time by the computer system as an item listing within the electronic commerce system; a render module to render the publication data to generate rendered publication data; a verification module, executed on the one or more processors, to, verify that the rendered publication data is not associated with malicious executable code, the verification module includes at least one filter to determine whether the rendered publication data is associated with malicious executable code, and to validate the rendered data at periodic intervals prior to publication to verify that the rendered publication data remains free of malicious executable code; and a publication module, executed on the one or more processors, to generate, if the publication data is determined to not be associated with malicious executable code, the item listing at least in part from the publication data.