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CVE-2026-27860

Published: Mar 27, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-90
3.7LOW
NVD MITRE
EPSS Score
0.3%
Top 78.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

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

Open-Xchange GmbH
commercial·DEaka open-xchange
OX Dovecot Pro
Communications
dovecot
oss-projectaka pigeonhole
dovecotOn-premWeb App
Communications / email-server-client
open-xchange
commercial·DEaka open-xchange gmbh, ox
dovecot
Communications

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-27860?We can run the check for you — a free external exposure review, no install. Check my exposure

References

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

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