CVE-2026-27860

MEDIUM EPSS 20.3%

Published Mar 27, 20263mo ago · Modified Jun 17, 20262w ago

5.3 CVSS 3.1

Medium

Published Mar 27, 2026 3mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

5.3

Exploitability

3.9

Impact

1.4

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality Low

Integrity None

Availability None

Threat Intelligence

EPSS Exploit Probability

20.3% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-90

Affected Products 2

Vendor	Product	Version	Range
dovecot	dovecot	*	<2.4.3
open-xchange	dovecot	*	<3.1.4

References 1

documentation.open-xchange.com https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json

Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.