What is CVE-2026-27860?

CVE-2026-27860 is a low-severity vulnerability in Dovecot, classified under LDAP Injection. CVSS score: 3.7/10. Published 2026-03-27.

How severe is CVE-2026-27860?

Low severity. CVSS v3 base score is 3.7 out of 10.

LDAP Injection in Dovecot

CVE-2026-27860

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…

EPSS: 0.000 (11.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Dovecot
Open-xchange Dovecot
Open-xchange Gmbh Ox Dovecot Pro — versions 0

Weakness classification (CWE)

CWE-90 — LDAP Injection

References

security@open-xchange.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27860?: CVE-2026-27860 is a low-severity vulnerability in Dovecot, classified under LDAP Injection. CVSS score: 3.7/10. Published 2026-03-27.
How severe is CVE-2026-27860?: Low severity. CVSS v3 base score is 3.7 out of 10.