CVE-2026-67223Network attack vector

LDAP identity confusion via unescaped username substitution

Published Sep 25, 2026 · Updated Sep 25, 2026

LDAP DN injection in RabbitMQ Server allows remote attackers to alter the LDAP bind identity through a crafted username. The fill/2 function substitutes ${username} into user_dn_pattern without RFC 4514 escaping, and the resulting distinguished name is used for the LDAP simple bind. Exploitation requires the LDAP plugin, a pattern containing ${username}, a useful directory layout, and a password valid for the resulting entry, which can represent a more privileged identity.

CVSS severity6.3
Medium
EPSS probability0.36%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

LDAP DN injection in RabbitMQ Server allows remote attackers to alter the LDAP bind identity through a crafted username. The fill/2 function substitutes ${username} into user_dn_pattern without RFC 4514 escaping, and the resulting distinguished name is used for the LDAP simple bind. Exploitation requires the LDAP plugin, a pattern containing ${username}, a useful directory layout, and a password valid for the resulting entry, which can represent a more privileged identity.

The record

CVE
CVE-2026-67223
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-90, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=>= 3.13.0, < 3.13.18
  2. Affected versionversion=>= 4.0.0, < 4.0.23
  3. Affected versionversion=>= 4.1.0, < 4.1.14
  4. Affected versionversion=>= 4.2.0, < 4.2.9
  5. Affected versionversion=>= 4.3.0, < 4.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.18; version=>= 4.0.0, < 4.0.23; version=>= 4.1.0, < 4.1.14; version=>= 4.2.0, < 4.2.9; version=>= 4.3.0, < 4.3.3

Published CVSS scores

6.3RabbitMQCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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')
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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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