CVE-2026-53658

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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Weakness Type (CWE)

CWE-90 CWE-90

References

Other References

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 https://github.com/hyperledger/fabric-ca/security/advisories/GHSA-xghw-p77p-3r7x

Frequently Asked Questions

What is CVE-2026-53658? +

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.

How do I check if I'm vulnerable to CVE-2026-53658? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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