ServiceNow - Username Enumeration Vulnerability (CVE-2021-45901)
During a recent engagement Trustwave SpiderLabs discovered a vulnerability (CVE-2021-45901) within ServiceNow (Orlando) which allows for a successful username enumeration by using a wordlist. By using an unauthenticated session and navigating to the password reset form, it is possible to infer a valid username. This is achieved through examination of the HTTP POST response data initially triggered by the password reset web form. This response differs depending on a username's existence.