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By the Year

In 2026 there have been 466 vulnerabilities in Microsoft 365 Apps with an average score of 7.5 out of ten. Last year, in 2025 365 Apps had 154 security vulnerabilities published. That is, 312 more vulnerabilities have already been reported in 2026 as compared to last year. Last year, the average CVE base score was greater by 0.22




Year Vulnerabilities Average Score
2026 466 7.48
2025 154 7.70
2024 42 7.69
2023 56 7.46
2022 46 7.26
2021 64 7.45
2020 54 7.25

It may take a day or so for new 365 Apps vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.

Recent Microsoft 365 Apps Security Vulnerabilities

Oct 2026: Microsoft Office OneNote Remote Code Execution Vulnerability
CVE-2026-97781 8.8 - High - October 13, 2026

Improper neutralization of special elements used in a command ('command injection') in Microsoft Office OneNote allows an unauthorized attacker to execute code over a network.

Command Injection

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-69922 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97775 8.8 - High - October 13, 2026

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97772 8.8 - High - October 13, 2026

Double free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Double-free

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97768 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97763 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-97760 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97746 8.8 - High - October 13, 2026

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Integer underflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97745 8.8 - High - October 13, 2026

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97004 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97742 8.8 - High - October 13, 2026

Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Stack Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97741 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-97779 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97777 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97773 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97769 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97762 8.8 - High - October 13, 2026

Out-of-bounds write in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Memory Corruption

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97757 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97756 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-97743 6.5 - Medium - October 13, 2026

Use after free in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97007 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97008 8.8 - High - October 13, 2026

Buffer underwrite ('buffer underflow') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

buffer underrun

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97738 8.8 - High - October 13, 2026

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97010 8.8 - High - October 13, 2026

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97011 8.8 - High - October 13, 2026

Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Use of Uninitialized Resource

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97748 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-88190 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-88192 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-88195 6.5 - Medium - October 13, 2026

Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Buffer Over-read

Oct 2026: Microsoft Office PowerPoint Information Disclosure Vulnerability
CVE-2026-88203 6.5 - Medium - October 13, 2026

Untrusted pointer dereference in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network.

Untrusted Pointer Dereference

Oct 2026: Microsoft Office PowerPoint Remote Code Execution Vulnerability
CVE-2026-88207 7.5 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Word Security Feature Bypass Vulnerability
CVE-2026-88210 7.8 - High - October 13, 2026

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

Reliance on Untrusted Inputs in a Security Decision

Oct 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-85340 7.8 - High - October 13, 2026

Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

Dangling pointer

Oct 2026: Microsoft Office PowerPoint Remote Code Execution Vulnerability
CVE-2026-88144 8.8 - High - October 13, 2026

Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-88154 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-88172 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office PowerPoint Information Disclosure Vulnerability
CVE-2026-88183 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-88184 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-88185 8.1 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-88186 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-70242 9.8 - Critical - October 13, 2026

Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-70254 8.8 - High - October 13, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Out-of-bounds Read

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-70219 6.5 - Medium - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office PowerPoint Remote Code Execution Vulnerability
CVE-2026-70215 8.8 - High - October 13, 2026

Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.

Dangling pointer

Oct 2026: Microsoft Office Excel Information Disclosure Vulnerability
CVE-2026-70214 5.5 - Medium - October 13, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Oct 2026: Microsoft Office Outlook Information Disclosure Vulnerability
CVE-2026-70281 7.5 - High - October 13, 2026

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

Out-of-bounds Read

Oct 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-88109 7.8 - High - October 13, 2026

Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

Dangling pointer

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-77902 8.8 - High - October 13, 2026

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Heap-based Buffer Overflow

Oct 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-97774 7 - High - October 13, 2026

Time-of-check time-of-use (toctou) race condition in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

TOCTTOU

Oct 2026: Microsoft Office Excel Remote Code Execution Vulnerability
CVE-2026-97759 8.8 - High - October 13, 2026

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Dangling pointer

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