CVE-2026-40193Public exploitNetwork attack vector

Identity spoofing and LDAP disclosure via unescaped usernames

Published Apr 15, 2026 · Updated Apr 15, 2026

LDAP injection in foxcpp Maddy Mail Server before 0.9.3 allows remote attackers to expose LDAP data via crafted authentication usernames. The auth.ldap Lookup() and AuthPlain() paths insert raw usernames into LDAP filters and DN templates with strings.ReplaceAll() instead of escaping LDAP metacharacters. Exposure requires network access to an SMTP submission or IMAP authentication endpoint configured with auth.ldap; crafted filters enable identity spoofing, directory enumeration, and blind attribute extraction.

CVSS severity8.2
High
EPSS probability0.42%
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 foxcpp Maddy Mail Server before 0.9.3 allows remote attackers to expose LDAP data via crafted authentication usernames. The auth.ldap Lookup() and AuthPlain() paths insert raw usernames into LDAP filters and DN templates with strings.ReplaceAll() instead of escaping LDAP metacharacters. Exposure requires network access to an SMTP submission or IMAP authentication endpoint configured with auth.ldap; crafted filters enable identity spoofing, directory enumeration, and blind attribute extraction.

The record

CVE
CVE-2026-40193
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
foxcpp
Product
Maddy Mail Server
Classifications
CWE-90, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=< 0.9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

foxcpp · Maddy Mail Serverversion=< 0.9.3

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1190Exploit Public-Facing Application

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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