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CVE-2026-49268

Apache Shiro vulnerability

9.1 CRITICALEPSS 0.76%
  1. Published17 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Shiro< 2.2.1 · 3.0.0

Remediation

Fixed in
Apache Shiro≥ 2.2.1

References

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Frequently asked

Is CVE-2026-49268 being actively exploited?

CVE-2026-49268 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.76%.

How severe is CVE-2026-49268?

CVE-2026-49268 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.76% probability of exploitation.

Which products are affected by CVE-2026-49268?

Affected products include Apache Shiro.

How do I fix CVE-2026-49268?

Upgrade affected software to a fixed version, for example Apache Shiro 2.2.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-49268 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.