Is CVE-2026-4430 actively exploited?

No active exploitation of CVE-2026-4430 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4430 be exploited remotely?

No. CVE-2026-4430 requires local access to exploit.

What is the CVSS score of CVE-2026-4430?

CVE-2026-4430 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-4430

HIGH

CVE-2026-4430

CWE-787Published: May 7, 2026· Updated: May 8, 2026

7.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.9th

Official Description

Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters.

This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.

NVD Source

Technical Analysis

CVE-2026-4430 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.