In some embodiments, an electronic signature service automatically updates electronic documents to prevent execution by an unauthorized signatory. The electronic signature service can receive an electronic document to be electronically signed on behalf of an organization. The electronic signature service can retrieve organization data indicative of signatories that are authorized to electronically sign the electronic document. The organization data may be inaccessible to a first signatory that is associated with the document. The electronic signature service can determine from the organization data that the first signatory is not authorized to electronically sign the document. The electronic signature service can update the electronic document with a second signatory that is determined from the organization data as being authorized to execute the document. The electronic signature service can prevent the first signatory from executing the document and provide access to the electronic document by a computing device associated with the second signatory.