Input Validation Flaw in Dovecot by Open-Xchange
CVE-2026-27851

7.4HIGH

Key Information:

Vendor

Open-xchange Gmbh

Status
Ox Dovecot Pro
Vendor
CVE Published:
12 May 2026

What is CVE-2026-27851?

An input validation flaw in Dovecot when using the safe filter with variable expansion allows subsequent pipelines on the same string to be misinterpreted as safe. This misconfiguration may result in the potential unescaping of unsafe data, leading to SQL and LDAP injection vulnerabilities during authentication processes. Users are advised to refrain from using the safe filter until a patch is applied, as no publicly available exploits are currently known.

Affected Version(s)

OX Dovecot Pro 0 <= 3.1.4

OX Dovecot Pro 0 <= 2.4.3

References

https://documentation.open-xchange.com/dovecot/security/a...
vendor-advisory

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.