CVE-2026-53658
Fabric CA: LDAP Injection via Unescaped Username in GetUser Filter
- State
- Published
- Severity
- 6.3 Medium
- Published
- Sep 15, 2026
- Updated
- Sep 16, 2026
- Reserved
- Jun 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Affected Products
| Product | Versions |
|---|---|
fabric-cahyperledger |
|
References
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