CVE-2026-27860

LOW

3.7

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.

CVE Details

CVSS v3.1 Score3.7

SeverityLOW

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published3/27/2026

Last Modified3/30/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-90

References

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

IOC Correlations

No correlations recorded

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