The Syracom Secure Login (2FA) plugin for Jira, Confluence, and Bitbucket through 3.1.4.5 allows remote attackers to easily brute-force the 2FA PIN via the plugins/servlet/twofactor/public/pinvalidation endpoint. The last 30 and the next 30 tokens are valid.
NVD-CWE-noinfo, CWE-799