CVE-2026-21880Public exploitNetwork attack vector

User enumeration via unescaped LDAP filter substitution

Published Jan 8, 2026 · Updated Jan 8, 2026

LDAP injection in Kanboard 1.2.48 and earlier allows remote attackers to enumerate directory users through the login form. The app/Core/Ldap/User.php getLdapUserPattern() function inserts the submitted username into LDAP_USER_FILTER with str_replace() without escaping LDAP metacharacters. LDAP authentication must be enabled and connected to a directory; injected wildcard or prefix filters disclose matching usernames and attributes, but LDAP bind still requires a valid password.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

LDAP injection in Kanboard 1.2.48 and earlier allows remote attackers to enumerate directory users through the login form. The app/Core/Ldap/User.php getLdapUserPattern() function inserts the submitted username into LDAP_USER_FILTER with str_replace() without escaping LDAP metacharacters. LDAP authentication must be enabled and connected to a directory; injected wildcard or prefix filters disclose matching usernames and attributes, but LDAP bind still requires a valid password.

The record

CVE
CVE-2026-21880
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
Kanboard
Product
Kanboard
Classifications
CWE-90, CWE-200, T1190, T1087.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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=< 1.2.49

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kanboard · Kanboardversion=< 1.2.49

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitPublished

Weakness, pattern, technique

CWE-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application
T1087.002Domain Account

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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