CVE-2026-13696: LDAP Injection in HAVELSAN Liman MYS – Patch & Detection Guide

Technical summary

CVE-2026-13696 is an LDAP injection flaw (CWE-90) in Liman MYS that arises from insufficient neutralization of special characters in LDAP query construction. The vulnerability requires authentication (PR:L in the CVSS vector) but does not require user interaction. Once authenticated, an attacker can inject LDAP metacharacters—such as asterisks, parentheses, and boolean operators—into input fields that flow into LDAP directory queries. This allows circumvention of intended access controls and potential disclosure or modification of directory data. The vulnerability affects Liman MYS versions prior to release.Master.1107.

Business impact

Compromised directory integrity and unauthorized access represent significant operational and compliance risks. An internal threat actor or compromised account holder can extract sensitive identity and organizational data from LDAP directories, modify group memberships to escalate privileges, or disable accounts. For organizations relying on Liman MYS for identity and access management, this could lead to lateral movement across systems, regulatory violations (GDPR, HIPAA), and loss of audit trail integrity. The requirement for prior authentication limits the attack surface but does not eliminate risk in environments with weak credential hygiene.

Affected systems

HAVELSAN Inc. Liman MYS versions prior to release.Master.1107 are affected. Verify your deployed version against the vendor release notes. Organizations using Liman MYS for LDAP-based identity management, directory synchronization, or authentication bridging should prioritize inventory and patching. No CVSS modifier adjustments suggest the vulnerability applies across standard deployments without unusual configurations.

Exploitability

Exploitability is moderate to high in practice. The CVSS score of 8.8 (HIGH) reflects that exploitation requires valid credentials (reducing opportunistic attacks) but does not require user interaction once inside the application. In environments with shared service accounts, weak password policies, or credential leakage, the authentication barrier is less protective. Direct LDAP injection is straightforward once an attacker identifies an injectable parameter—no complex tools or zero-day techniques are required. Public disclosure date increases the likelihood of proof-of-concept code appearing in security research communities.

Remediation

Upgrade Liman MYS to release.Master.1107 or later. Verify the upgrade is complete by checking the application version in administrative settings and confirming that LDAP queries are properly parameterized. As an interim mitigation, restrict LDAP query permissions to the minimum necessary, audit LDAP query logs for suspicious patterns (wildcard abuse, boolean operators in unexpected fields), and enforce strong authentication on Liman MYS administrative accounts. Implement network segmentation to limit lateral movement if directory data is compromised.

Patch guidance

HAVELSAN has issued release.Master.1107 to address this vulnerability. Apply the patch during a maintenance window to avoid service disruption to dependent applications. Before patching production, test the upgrade in a staging environment to confirm compatibility with existing LDAP directory schemas and downstream integrations. Verify that identity synchronization and authentication workflows continue to function normally post-upgrade. Document the patch date and review LDAP access logs before and after the patch to establish a baseline.

Detection guidance

Monitor Liman MYS LDAP query logs for anomalous patterns: injection attempts often contain special characters such as asterisks (*), pipes (|), ampersands (&), or parentheses in user input fields that should contain only alphanumeric or email-format data. Look for queries that modify or enumerate directory objects unexpectedly. Set alerts on failed LDAP authentication attempts preceded by successful Liman MYS authentication, which may indicate query manipulation. Review system access logs for unusual LDAP filter complexity or repeated failed queries from the same user. Network IDS signatures targeting LDAP injection may also flag suspicious traffic.

Why prioritize this

HIGH severity combined with active authentication-only access makes this a near-term priority. Unlike unauthenticated remote code execution vulnerabilities, this requires an insider threat or credential compromise, but the impact—unauthorized directory access and privilege escalation—is severe. Organizations with strict identity governance frameworks should patch urgently; those with mature credential management and LDAP monitoring may operate with slightly lower immediate risk. The absence of KEV status does not indicate lower risk; it reflects the age of the CVE record and lower weaponization incentive compared to remote exploits.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) is justified by: (1) Confidentiality Impact: High—attackers can read sensitive directory objects including user attributes, group memberships, and email addresses; (2) Integrity Impact: High—attackers can modify directory entries, create rogue accounts, or alter group permissions; (3) Availability Impact: High—attackers could disable critical service accounts or disrupt directory replication; (4) Attack Vector: Network (common attack surface); (5) Attack Complexity: Low (no complex conditions needed); (6) Privileges Required: Low (authenticated user). The HIGH severity reflects realistic damage potential in typical deployments where directory compromise enables further system compromise.

Frequently asked questions