CVE-2026-23901— Apache Shiro: Brute force attack possible to determine valid user names

Apache Shiro: Brute force attack possible to determine valid user names

Observable Timing Discrepancy vulnerability in Apache Shiro. This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7. Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue. Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force attack may be able to tell, by timing the requests only, determine if the request failed because of a non-existent user vs. wrong password. The most likely attack vector is a local attack only. Shiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well. Typically, brute force attack can be mitigated at the infrastructure level.

N/A

通过时间差异性导致的信息暴露

Apache Shiro 安全漏洞

Apache Shiro是美国阿帕奇（Apache）基金会的一套用于执行认证、授权、加密和会话管理的Java安全框架。 Apache Shiro 1.*版本和2.0.7之前版本存在安全漏洞，该漏洞源于存在可观察的时间差异，可能导致暴力破解攻击。

N/A

N/A