CVE-2026-40363
Microsoft Office Remote Code Execution Vulnerability
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
INFO
Published Date :
May 12, 2026, 6:17 p.m.
Last Modified :
May 22, 2026, 2:49 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-40363
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | f38d906d-7342-40ea-92c1-6c4a2c6478c8 | ||||
| CVSS 3.1 | HIGH | [email protected] |
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40363.
| URL | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40363 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40363
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40363 vulnerability anywhere in the article.
-
CrowdStrike.com
May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEs
Microsoft has addressed 130 vulnerabilities in its May 2026 security update release, fewer than April’s 164 vulnerabilities. This month's patches include fixes for 30 Critical vulnerabilities, along w ... Read more
The following table lists the changes that have been made to the
CVE-2026-40363 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CPE Deprecation Remap by [email protected]
May. 22, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:microsoft:office:*:*:*:*:*:android:*:* versions from (excluding) 16.0.19822.20190 OR *cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:* versions from (excluding) 16.0.19822.20190 -
Initial Analysis by [email protected]
May. 19, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:* *cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* *cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* *cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:* *cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:* *cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:* *cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* *cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:* *cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:* *cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:* *cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:* *cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:* *cpe:2.3:a:microsoft:office:*:*:*:*:*:android:*:* versions up to (excluding) 16.0.19822.20190 Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363 Types: Vendor Advisory -
New CVE Received by [email protected]
May. 12, 2026
Action Type Old Value New Value Added Description Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-122 Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363