What is CVE-2026-42832?

CVE-2026-42832 is a high-severity vulnerability in Microsoft Excel, classified under Improper Access Control. CVSS score: 7.7/10. Published 2026-05-12.

How severe is CVE-2026-42832?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Microsoft Excel

CVE-2026-42832

Improper access control in Microsoft Office allows an unauthorized attacker to perform spoofing locally.

EPSS: 0.000 (14.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Microsoft Excel
Microsoft Excel For Android — versions 16.0.0.0
Microsoft Office Ltsc For Mac 2021 — versions 16.0.1
Microsoft Office Ltsc For Mac 2024 — versions 16.0.0
Microsoft Word For Android — versions 16.0.0.0
Microsoft Office — versions 2021, 2024
Microsoft Office_long_term_servicing_channel — versions 2021
Microsoft Word

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

Microsoft Office Spoofing Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42832?: CVE-2026-42832 is a high-severity vulnerability in Microsoft Excel, classified under Improper Access Control. CVSS score: 7.7/10. Published 2026-05-12.
How severe is CVE-2026-42832?: High severity. CVSS v3 base score is 7.7 out of 10.