CVE-2026-53658
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
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.
Risk Assessment
An attacker can manipulate LDAP searches and steer authentication toward victim accounts, potentially leading to unauthorized access or account lockout. The risk applies only to Fabric CA deployments with an LDAP backend.
Recommendation
Update Fabric CA to version 1.5.21 or later. If you do not use LDAP, ensure the LDAP backend is not enabled, and restrict network access to the CA enrollment endpoint.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

