Low severity3.7NVD Advisory· Published Mar 27, 2026· Updated Apr 29, 2026

CVE-2026-27860

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.

Affected products

Dovecot (software)/Dovecot
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
Range: <2.4.3
Open-Xchange/Dovecot
cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*
Range: <3.1.4

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.jsonnvdVendor Advisory

News mentions

No linked articles in our index yet.

cvss	0.240
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000