What is CVE-2026-72977?

CVE-2026-72977 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-09-08.

How severe is CVE-2026-72977?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Microsoft 365 Apps For Enterprise

CVE-2026-72977

Out-of-bounds read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Microsoft 365 Apps For Enterprise
Microsoft Office 2019
Microsoft Office 365 For Mac
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Microsoft Office Ltsc For Mac 2021
Microsoft Office Ltsc For Mac 2024
Microsoft Powerpoint 2016

Weakness classification (CWE)

CWE-20 — Improper Input Validation
CWE-125 — Out-of-bounds Read

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-72977?: CVE-2026-72977 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-09-08.
How severe is CVE-2026-72977?: Medium severity. CVSS v3 base score is 6.5 out of 10.