Information disclosure in Open-Xchange Gmbh Ox Dovecot Ce
CVE-2026-42392
An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Process memory contents can be disclosed to the client, which may include sensitive data. Disable the IMAP URLAUTH functionality. Update to non-vulnerable version. No publicly available exploits are known.
Vulnerability class: Information Disclosure
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
Weakness classification (CWE)
References
- security@open-xchange.com (vendor-advisory)
Frequently asked questions
- What is CVE-2026-42392?
- CVE-2026-42392 is a medium-severity vulnerability in Open-Xchange Gmbh Ox Dovecot Ce, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-08-28.
- How severe is CVE-2026-42392?
- Medium severity. CVSS v3 base score is 4.3 out of 10.