CVE-2026-53658
Received Received - Intake

LDAP Injection in Fabric CA

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: GitHub, Inc.

Description
Fabric CA is a Certificate Authority for Hyperledger Fabric. Prior to 1.5.21, when fabric-ca is configured with an LDAP backend, Client.GetUser in lib/server/ldap/client.go inserts the username from HTTP Basic authentication into the LDAP uid search UserFilter without escaping LDAP metacharacters. An unauthenticated attacker with network access to the CA enrollment endpoint can alter the LDAP search before password validation and potentially steer authentication attempts toward a victim account. Deployments that do not use an LDAP backend are unaffected. This issue is fixed in version 1.5.21.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-53658
EUVD
EUVD-2026-78835

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
hyperledger fabric_ca 1.5.21

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-90 The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

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Executive Summary

This vulnerability is an LDAP injection flaw in Hyperledger Fabric CA versions 1.5.20 and earlier when configured with an LDAP backend. It occurs because the username from HTTP Basic authentication is inserted into an LDAP uid search filter without proper escaping of special characters. An unauthenticated attacker with network access to the CA enrollment endpoint can manipulate LDAP queries before password validation, potentially redirecting authentication attempts to a victim account.

Detection Guidance

To detect this vulnerability, check if your Hyperledger Fabric CA is running a version prior to 1.5.21 and configured with an LDAP backend. Run the command: fabric-ca-server version to verify the version. Inspect the server configuration file for LDAP settings. Monitor logs for unusual LDAP query patterns or failed authentication attempts that may indicate exploitation attempts.

Impact Analysis

An attacker could exploit this to gain unauthorized access to accounts by steering authentication attempts toward a victim account. This may lead to privilege escalation, data breaches, or unauthorized actions within the system. Deployments not using an LDAP backend are unaffected.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR (data protection) or HIPAA (health information privacy). Organizations using affected versions must address this flaw to maintain regulatory compliance.

Mitigation Strategies

Immediately update Hyperledger Fabric CA to version 1.5.21 or later. If LDAP is not required, disable the LDAP backend in the configuration. Restrict network access to the CA enrollment endpoint using firewalls or network policies. Review and audit LDAP query logs for suspicious activity. Apply the patch from the official repository if upgrading is not immediately feasible.

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