CVE-2026-53658Network attack vectorHinoki check available

Authentication steering via unescaped LDAP username

Published Sep 15, 2026 · Updated Sep 15, 2026

LDAP injection in Hyperledger Fabric CA before 1.5.21 allows remote attackers to alter directory searches through crafted usernames. Client.GetUser formats an HTTP Basic username directly into the configured LDAP UserFilter without escaping filter metacharacters. Exposure requires a network-reachable enrollment endpoint and an enabled LDAP backend; successful injection can steer password validation toward a victim account.

CVSS severity6.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

LDAP injection in Hyperledger Fabric CA before 1.5.21 allows remote attackers to alter directory searches through crafted usernames. Client.GetUser formats an HTTP Basic username directly into the configured LDAP UserFilter without escaping filter metacharacters. Exposure requires a network-reachable enrollment endpoint and an enabled LDAP backend; successful injection can steer password validation toward a victim account.

The record

CVE
CVE-2026-53658
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Hyperledger Foundation
Product
Hyperledger Fabric CA
Classifications
CWE-90, CAPEC-136, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.5.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hyperledger Foundation · Hyperledger Fabric CAversion=< 1.5.21

Published CVSS scores

6.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CAPEC-136LDAP Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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