medium6.3
CVE-2026-53658
Fabric CA Developer's Guide: LDAP Injection via Unescaped Username in GetUser Filter
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/hyperledger/fabric-ca | <= 1.5.20 | 1.5.21 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-xghw-p77p-3r7x
- https://github.com/hyperledger/fabric-ca/security/advisories/GHSA-xghw-p77p-3r7x
- https://github.com/hyperledger/fabric-ca/commit/d379df823534d56dec0166a6da8f0415e3beee24
- https://github.com/hyperledger/fabric-ca/pull/501
- https://github.com/hyperledger/fabric-ca/releases/tag/v1.5.21