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Hyperledger fabric-ca CVE-2026-53658

MEDIUM
LDAP Injection (CWE-90)
2026-08-14 https://github.com/hyperledger/fabric-ca GHSA-xghw-p77p-3r7x
LDAP Code Injection
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vuln.today AI
8.2 HIGH

Network-accessible pre-auth endpoint (AV:N/PR:N); integrity rated High due to potential fraudulent certificate issuance from a CA; limited LDAP data exposure warrants C:L; no availability impact identified.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 14, 2026 - 19:51 vuln.today
Analysis Generated
Aug 14, 2026 - 19:51 vuln.today

DescriptionCVE.org

When fabric-ca is configured with an LDAP backend, the username from HTTP Basic authentication is included in an LDAP uid search filter without proper escaping. An unauthenticated attacker with network access to the CA enrollment endpoint could exploit this to perform LDAP injection before password validation, and potentially steer authentication attempts toward a victim account.

Recommendation

  • All users of fabric-ca with an LDAP backend should update to a fixed version.
  • For users not using an LDAP backend, no action is required.

AnalysisAI

LDAP injection in Hyperledger fabric-ca allows unauthenticated network attackers to manipulate LDAP search filters at the CA enrollment endpoint before password validation occurs. Versions 1.5.20 and earlier are affected when the LDAP backend is configured; installations using the default local identity store are not exposed. …

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Vulnerability AssessmentAI

Exploitation Exploitation requires that fabric-ca be explicitly configured with an LDAP backend - the ldap configuration block in fabric-ca-server-config.yaml must reference an active LDAP server. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment No CVSS vector or EPSS score was supplied with this advisory, so quantitative risk signals are unavailable and must be inferred from the description and patch diff. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary remediation is upgrading fabric-ca to version 1.5.21, which introduces proper LDAP filter escaping via ldap.EscapeFilter() in the GetUser function. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-53658 vulnerability details – vuln.today
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