CVE-2026-75007Network attack vectorHinoki check available

Privilege escalation via LDAP filter injection

Published Aug 17, 2026 · Updated Aug 18, 2026

LDAP injection in Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3 allows remote authenticated users to alter LDAP-backed lookups. In program/lib/Roundcube/rcube_ldap.php, the _connect() and get_record_groups() paths substituted %u, %fu, %d, and a decoded contact DN into LDAP filter inputs without rcube_ldap_generic::quote_string() escaping, allowing crafted values to change the resulting filter. Reachability depends on an installation using LDAP directories or group lookups with attacker-influenced account data; in that configuration, the flaw can expose unintended directory data or return privilege-affecting matches, but the published fix does not indicate code execution.

CVSS severity5.4
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

LDAP injection in Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3 allows remote authenticated users to alter LDAP-backed lookups. In program/lib/Roundcube/rcube_ldap.php, the _connect() and get_record_groups() paths substituted %u, %fu, %d, and a decoded contact DN into LDAP filter inputs without rcube_ldap_generic::quote_string() escaping, allowing crafted values to change the resulting filter. Reachability depends on an installation using LDAP directories or group lookups with attacker-influenced account data; in that configuration, the flaw can expose unintended directory data or return privilege-affecting matches, but the published fix does not indicate code execution.

The record

CVE
CVE-2026-75007
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Roundcube
Product
Roundcube Webmail
Classifications
CWE-77
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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=1.6.0 <1.6.18
  2. Affected versionversion=1.7.0 <1.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Roundcube · Roundcube Webmailversion=1.6.0 <1.6.18; version=1.7.0 <1.7.3

Published CVSS scores

5.4MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')

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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