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CVE-2026-53658

Fabric CA: LDAP Injection via Unescaped Username in GetUser Filter

MEDIUM
6.3
CVSS Score
Published: September 15, 2026 at 04:37 PM UTC
Updated: September 30, 2026 at 05:43 PM UTC
1 product affected across 1 vendorFabric CA

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fabric CA· Hyperledger
60%
v < 1.5.21
Affected range stops below 1.5.21, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/hyperledger/fabric-ca/security/advisories/GHSA-xghw-p77p-3r7x
x_refsource_MISC
Source: cverecord
https://github.com/hyperledger/fabric-ca/pull/501
x_refsource_MISC
Source: cverecord
https://github.com/hyperledger/fabric-ca/commit/d379df823534d56dec0166a6da8f0415e3beee24
x_refsource_MISC
Source: cverecord
https://github.com/hyperledger/fabric-ca/releases/tag/v1.5.21

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-90

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