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.

INFO

Published Date :

2026-03-27T08:10:22.695Z

Last Modified :

2026-03-27T12:33:57.043Z

Source :

OX
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27860 vulnerability.

Vendors Products
Dovecot
  • Dovecot
Open-xchange
  • Dovecot
  • Ox Dovecot Pro
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27860.

URL Resource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-27860 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-27860 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Privileges Required
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact