CVE-2026-42389
Received Received - Intake
Extra Validation Bypass in Open-Xchange 5.4.x

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: Open-Xchange

Description
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
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Meta Information
Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-06-25
AI Q&A
2026-06-25
EPSS Evaluated
N/A
NVD
CVE-2026-42389
EUVD
EUVD-2026-39388
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
open-xchange 5.4 *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability relates to the 5.4.x branch of Open-Xchange software and involves insufficient validation of incoming answers from authoritative servers. The fix introduces extra hardening by performing additional validation on these incoming responses to prevent potential issues.

Impact Analysis

The vulnerability has a CVSS base score of 5.3, indicating a medium severity. It does not impact confidentiality or availability but can lead to integrity issues. This means that an attacker could potentially manipulate or alter data received from authoritative servers, which might affect the correctness or trustworthiness of the information processed by the system.

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