LDAP DN Injection in Apache Shiro DefaultLdapRealm
CVE-2026-49268 is a remote LDAP distinguished name (DN) injection vulnerability in Apache Shiro's DefaultLdapRealm. The flaw is caused by directly concatenating user-supplied username input into the LDAP DN template used for bind authentication without escaping RFC 2253 special characters. Because the DN is constructed from untrusted input, an attacker can inject LDAP special characters and alter the resulting DN structure used during authentication. According to the provided content, this can enable authentication bypass and impersonation of other users. The issue affects Apache Shiro versions through 2.2.0 and 3.0.0-alpha-0 through 3.0.0-alpha-1 when DefaultLdapRealm is used.
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An authentication bypass vulnerability in Apache Shiro's DefaultLdapRealm caused by improper escaping of LDAP special characters during Distinguished Name construction from user-supplied usernames.
An LDAP DN injection vulnerability in Apache Shiro DefaultLdapRealm that allows remote attackers to manipulate DN construction during LDAP bind authentication, potentially bypassing authentication or impersonating users.
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