Description
A remote attacker can inject LDAP special characters into the Distinguished Name (DN) construction in DefaultLdapRealm class. User-supplied username input is directly concatenated into the LDAP DN template without any escaping of RFC 2253 special characters. This allows an attacker to manipulate the DN structure used for LDAP bind authentication, potentially bypassing authentication or impersonating other users.
This issue affects all Apache Shiro versions through 2.2.0, and 3.0.0-alpha-1 when using DefaultLdapRealm Upgrade to Apache Shiro 2.2.1 or 3.0.0-alpha-2 or later, which fixes the issue.
Metrics
CVSS 3.1 9.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Shiro | <= 2.2.0; >= 3.0.0-alpha-0, <= 3.0.0-alpha-1 |
References
- https://lists.apache.org/thread/svszql3od8td7hn6conyj2oq70v53b5sMailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/06/17/8Third Party Advisory
Timeline
- Published
- Jun 17, 2026
- Last modified
- Oct 26, 2026
- NVD status
- Analyzed