CVE-2026-42392: Exposure of Sensitive Information to an Unauthorized Actor in Open-Xchange GmbH OX Dovecot Pro
Description
CVE-2026-42392 is a medium severity vulnerability in Open-Xchange GmbH OX Dovecot Pro version 2.3.0. An attacker with valid credentials can send an invalid IMAP URLFETCH command that causes uninitialized memory to be included in the error response. This may disclose process memory contents, potentially exposing sensitive data. No public exploits are known. Mitigation includes disabling the IMAP URLAUTH functionality and updating to a non-vulnerable version if available.
CVSS v3.1
Score 4.3medium
Affected software
Open-Xchange GmbH
OX Dovecot Pro
Open-Xchange GmbH
OX Dovecot CE
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability allows an authenticated attacker to trigger an invalid IMAP URLFETCH command in OX Dovecot Pro 2.3.0, resulting in uninitialized memory being leaked in the error response. The leaked memory may contain sensitive information from the process memory. The issue arises from improper handling of the URLFETCH command when URLAUTH functionality is enabled. There is no known public exploit, and no official patch or remediation level is specified in the vendor data.
Potential Impact
An attacker with valid credentials can obtain sensitive information from process memory due to uninitialized memory disclosure in error responses. This could lead to unauthorized exposure of sensitive data. The vulnerability does not affect integrity or availability, only confidentiality to a limited extent.
Mitigation Recommendations
Disable the IMAP URLAUTH functionality to prevent exploitation. Additionally, update to a non-vulnerable version of OX Dovecot Pro if such a version is available. Since no official patch or remediation level is provided, check vendor advisories for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-04-27T08:53:58.839Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a916f8dacd9273b49cf924a
Added to database: 08/28/2026, 11:22:53 UTC
Last enriched: 09/10/2026, 02:39:01 UTC
Last updated: 10/10/2026, 18:48:19 UTC
Views: 62
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.