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Vulnerability Details :

CVE-2026-27860

Summary
Assigner-OX
Assigner Org ID-8ce71d90-2354-404b-a86e-bec2cc4e6981
Published At-27 Mar, 2026 | 08:10
Updated At-27 Mar, 2026 | 12:33
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:OX
Assigner Org ID:8ce71d90-2354-404b-a86e-bec2cc4e6981
Published At:27 Mar, 2026 | 08:10
Updated At:27 Mar, 2026 | 12:33
Rejected At:
â–¼CVE Numbering Authority (CNA)

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
Vendor
Open-Xchange AGOpen-Xchange GmbH
Product
OX Dovecot Pro
Modules
  • core
Default Status
unaffected
Versions
Affected
  • From 0 through 3.1.0 (semver)
  • From 0 through 2.4.0 (semver)
Problem Types
TypeCWE IDDescription
cweCWE-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Type: cwe
CWE ID: CWE-90
Description: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Metrics
VersionBase scoreBase severityVector
3.13.7LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Version: 3.1
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
vendor-advisory
Hyperlink: https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
Resource:
vendor-advisory
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@open-xchange.com
Published At:27 Mar, 2026 | 09:16
Updated At:29 Apr, 2026 | 19:26

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.13.7LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Type: Primary
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CPE Matches

Dovecot
dovecot
>>dovecot>>Versions before 2.4.3(exclusive)
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
Open-Xchange AG
open-xchange
>>dovecot>>Versions before 3.1.4(exclusive)
cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*
Weaknesses
CWE IDTypeSource
CWE-90Secondarysecurity@open-xchange.com
CWE ID: CWE-90
Type: Secondary
Source: security@open-xchange.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.jsonsecurity@open-xchange.com
Vendor Advisory
Hyperlink: https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
Source: security@open-xchange.com
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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Details not found