What’s Vulnerable › Vulnerabilities

CVE-2026-53658: Fabric CA: LDAP Injection via Unescaped Username in GetUser Filter

• Severity: medium (CVSS 6.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-90

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.

Affected products

• hyperledger fabric-ca: before 1.5.21

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

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