CVE-2026-49268

EUVD-2026-37701

17.06.2026, 14:17

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.

LDAP Injection

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
apache	CNA	8.8 HIGH	NETWORK	LOW	NONE	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L/U:Red

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
apache	shiro	𝑥 ≤ 2.2.0	CNA

Common Weakness Enumeration

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

https://lists.apache.org/thread/svszql3od8td7hn6conyj2oq70v53b5s

http://www.openwall.com/lists/oss-security/2026/06/17/8