CVE-2026-27856
MEDIUM WAF: Low
CVSS 5.9
Published: 2026-03-27
CWE-287
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
WAF Coverage Analysis
Improper Authentication
Low WAF Coverage
OWASP: A07:2021 Identification and Authentication Failures
Affected Software
| Vendor | Product | Version |
|---|---|---|
| dovecot | dovecot | up to 2.4.3 |
| open-xchange | dovecot | up to 2.3.22.1 |
| open-xchange | dovecot | 3.0.0 - 3.0.5 |
| open-xchange | dovecot | 3.1.0 - 3.1.4 |
References
- documentation.open-xchange.com (Vendor Advisory)