What’s Vulnerable › Vulnerabilities

CVE-2026-49268: Apache Shiro: LDAP DN Injection in DefaultLdapRealm

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-17 · updated 2026-10-26
• Weakness: CWE-90

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.

Affected products

• Apache Software Foundation Apache Shiro: before 2.2.1; 3.0.0-alpha1 — fixed in 2.2.1

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Shiro 2.2.1. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/svszql3od8td7hn6conyj2oq70v53b5s
• http://www.openwall.com/lists/oss-security/2026/06/17/8

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