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CVE-2026-27860

Published: Mar 27, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-90
NVD MITRE
3.7CVSSLOW
EPSS Score
0.3%
Top 79.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-90

Affected Products

OX Dovecot ProOpen-Xchange GmbH
On-prem
Enterprise Software / collaboration-groupware
dovecotdovecot
On-premWeb App
Communications / email-server-client
dovecotopen-xchangeCommunications
open-xchange gmbhcommercialDEEnterprise Softwareaka open-xchange
dovecotoss-projectCommunicationsaka dovecot, pigeonhole
open-xchangecommercialDECommunicationsaka open-xchange gmbh, ox

Exploitability

Official Patch Available

References

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

Timeline

Published
Mar 27, 2026
Last Updated
Apr 29, 2026

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