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Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

CVE-2026-49268

High
8.8/10

Summary

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.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • NONE

CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

The software constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

References

Advisory Timeline

  • Published