by Kastro
Paper/Archive/CVE-2026-49268

CVE-2026-49268

Apache Software Foundation Apache Shiro — Apache Shiro: LDAP DN Injection in DefaultLdapRealm

EPSS 0.5%CVSS 9.1
critical.is priorityof 100
36
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 43.6.436 × 208.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Apache Shiro≤ 2.2.0–CNA
Apache Shiro3.0.0-alpha-0 – 3.0.0-alpha-1–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
apache (CNA)8.8CVSS: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
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

advisorylists.apache.org/thread/svszql3od8td7hn6conyj2oq70v53b5srefopenwall.com/lists/oss-security/2026/06/17/8