CVE-2026-42389
Deferred Deferred - Pending Action

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-07-15
AI Q&A
2026-06-25
EPSS Evaluated
2026-07-14
NVD
CVE-2026-42389
EUVD
EUVD-2026-39388

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
open-xchange 5.4 *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
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.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-42389. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart