Apache Shiro — CVE-2026-49268 (Critical)

Date Jun 17, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Apache · Shiro

CVE CVE-2026-49268

Critical vendor advisory CVE-2026-49268

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 issu

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 9.1) in Apache Shiro. Patch or mitigate promptly.

Operator check

Review CVE-2026-49268 in your asset inventory. Apply patches per vendor guidance and verify Shiro is not exposed. CVSS score: 9.1.

Sources

NVD — CVE-2026-49268 Vendor reference Vendor reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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