The most relevant match for this specific terminology is the draft-ietf-oauth-security-topics-19.txt, an Internet-Draft from the IETF that provides critical security guidelines for OAuth implementations. Alternatively, "passlist.txt" often refers to lists of common or weak passwords used for security auditing, such as those found in SecLists on GitHub.
SecLists: A massive collection of multiple types of lists, including common credentials and usernames, maintained on GitHub for security researchers.
Security Research & Auditing: Wordlists like passlist.txt or passwords.txt are often hosted on platforms like GitHub for use in authorized penetration testing or to help users identify weak passwords.
A passlist.txt file acts as a blacklist or dictionary for password validation.