CVE-2026-49268

Apache Shiro: LDAP DN Injection in DefaultLdapRealm

Assigner: apache
Reserved: 28.05.2026 Published: 17.06.2026 Updated: 17.06.2026

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 Vector: 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
CVSS Score: 8.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Apache Software Foundation
Product	Apache Shiro
Versions	Default: unaffected affected from 0 to 2.2.0 (incl.) affected from 3.0.0-alpha-0 to 3.0.0-alpha-1 (incl.)

Vendor

Apache Software Foundation

Product

Apache Shiro

Versions

Default: unaffected

affected from 0 to 2.2.0 (incl.)
affected from 3.0.0-alpha-0 to 3.0.0-alpha-1 (incl.)

Credits

zhaokaifei (reporter) - ChinaTelecom finder
Lenny Primak <lenny@flowlogix.com> remediation developer

References

Problem Types