EUVD-2026-16573

| CVE-2026-27860 LOW
2026-03-27 OX
3.7
CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

5
Patch Released
Mar 31, 2026 - 13:49 nvd
Patch available
PoC Detected
Mar 30, 2026 - 13:26 vuln.today
Public exploit code
EUVD ID Assigned
Mar 27, 2026 - 08:30 euvd
EUVD-2026-16573
Analysis Generated
Mar 27, 2026 - 08:30 vuln.today
CVE Published
Mar 27, 2026 - 08:10 nvd
LOW 3.7

Tags

Ldap Authentication Bypass Code Injection

Description

If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.

Analysis

Open-Xchange Dovecot Pro contains an LDAP filter injection vulnerability in its authentication module that allows remote unauthenticated attackers to inject arbitrary LDAP filters when the auth_username_chars configuration parameter is left empty, potentially enabling authentication bypass and reconnaissance of LDAP directory structures. The vulnerability carries a low CVSS score of 3.7 due to high attack complexity requirements, and no public exploit code has been identified at the time of analysis.

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Remediation

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

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Priority Score

19
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +18
POC: +20

Vendor Status

Ubuntu

Priority: Medium
dovecot
Release Status Version
trusty not-affected code not present
xenial not-affected code not present
bionic not-affected code not present
focal not-affected code not present
jammy not-affected code not present
noble not-affected code not present
questing needed -
upstream released 2.4.3

Debian

dovecot
Release Status Fixed Version Urgency
bullseye vulnerable 1:2.3.13+dfsg1-2+deb11u1 -
bullseye (security) vulnerable 1:2.3.13+dfsg1-2+deb11u2 -
bookworm, bookworm (security) vulnerable 1:2.3.19.1+dfsg1-2.1+deb12u1 -
trixie vulnerable 1:2.4.1+dfsg1-6+deb13u3 -
trixie (security) vulnerable 1:2.4.1+dfsg1-6+deb13u1 -
forky, sid vulnerable 1:2.4.2+dfsg1-4 -
(unstable) fixed (unfixed) -

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EUVD-2026-16573 vulnerability details – vuln.today
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