Microsoft 365 Apps
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By the Year
In 2026 there have been 51 vulnerabilities in Microsoft 365 Apps with an average score of 7.7 out of ten. Last year, in 2025 365 Apps had 154 security vulnerabilities published. Right now, 365 Apps is on track to have less security vulnerabilities in 2026 than it did last year. However, the average CVE base score of the vulnerabilities in 2026 is greater by 0.05.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 51 | 7.75 |
| 2025 | 154 | 7.70 |
| 2024 | 42 | 7.69 |
| 2023 | 55 | 7.36 |
| 2022 | 46 | 7.26 |
| 2021 | 64 | 7.45 |
| 2020 | 54 | 7.30 |
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
May 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-40420
8.8 - High
- May 12, 2026
Improper access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Authorization
May 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-35436
8.8 - High
- May 12, 2026
Insufficient granularity of access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Insufficient Granularity of Access Control
May 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-40418
7.8 - High
- May 12, 2026
Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Dangling pointer
May 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-40367
8.4 - High
- May 12, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
May 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-40362
7.8 - High
- May 12, 2026
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
May 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-40361
8.4 - High
- May 12, 2026
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Dangling pointer
May 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-40359
7.8 - High
- May 12, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
May 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-40358
8.4 - High
- May 12, 2026
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
May 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-40421
4.3 - Medium
- May 12, 2026
External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
External Control of File Name or Path
May 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-40419
7.8 - High
- May 12, 2026
Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.
Dangling pointer
May 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-40366
8.4 - High
- May 12, 2026
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Dangling pointer
May 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-40364
8.4 - High
- May 12, 2026
Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Object Type Confusion
May 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-40363
8.4 - High
- May 12, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
May 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-40360
7.8 - High
- May 12, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Out-of-bounds Read
May 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-35440
5.5 - Medium
- May 12, 2026
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Files or Directories Accessible to External Parties
Apr 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-33115
8.4 - High
- April 14, 2026
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-33114
8.4 - High
- April 14, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Apr 2026: Microsoft PowerPoint Remote Code Execution Vulnerability
CVE-2026-32200
7.8 - High
- April 14, 2026
Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-32199
7.8 - High
- April 14, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-32198
7.8 - High
- April 14, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-32197
7.8 - High
- April 14, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-32190
8.4 - High
- April 14, 2026
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-23657
7.8 - High
- April 14, 2026
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-33822
6.1 - Medium
- April 14, 2026
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Out-of-bounds Read
Apr 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-33095
7.8 - High
- April 14, 2026
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-32189
7.8 - High
- April 14, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
Apr 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-32188
7.1 - High
- April 14, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Out-of-bounds Read
Mar 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-26144
7.5 - High
- March 10, 2026
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
XSS
Mar 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-26110
8.4 - High
- March 10, 2026
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
Object Type Confusion
Mar 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-26109
8.4 - High
- March 10, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Out-of-bounds Read
Mar 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-26108
7.8 - High
- March 10, 2026
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
Mar 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-26107
7.8 - High
- March 10, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
Mar 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-26112
7.8 - High
- March 10, 2026
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Mar 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-26113
8.4 - High
- March 10, 2026
Untrusted pointer dereference in Microsoft Office allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Feb 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-21261
5.5 - Medium
- February 10, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Out-of-bounds Read
Feb 2026: Microsoft Outlook Spoofing Vulnerability
CVE-2026-21511
7.5 - High
- February 10, 2026
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Marshaling, Unmarshaling
Feb 2026: Microsoft Word Security Feature Bypass Vulnerability
CVE-2026-21514
7.8 - High
- February 10, 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
Feb 2026: Microsoft Outlook Spoofing Vulnerability
CVE-2026-21260
7.5 - High
- February 10, 2026
Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Information Disclosure
Feb 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-21258
5.5 - Medium
- February 10, 2026
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Improper Input Validation
Feb 2026: Microsoft Excel Elevation of Privilege Vulnerability
CVE-2026-21259
7.8 - High
- February 10, 2026
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.
Heap-based Buffer Overflow
Jan 2026: Microsoft Office Security Feature Bypass Vulnerability
CVE-2026-21509
7.8 - High
- January 26, 2026
Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
Reliance on Untrusted Inputs in a Security Decision
Jan 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20957
7.8 - High
- January 13, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Integer underflow
Jan 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20950
7.8 - High
- January 13, 2026
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Dangling pointer
Jan 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20952
8.4 - High
- January 13, 2026
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Jan 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-20948
7.8 - High
- January 13, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Jan 2026: Microsoft Excel Security Feature Bypass Vulnerability
CVE-2026-20949
7.8 - High
- January 13, 2026
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
Authorization
Jan 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20956
7.8 - High
- January 13, 2026
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Jan 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20953
8.4 - High
- January 13, 2026
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Jan 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20955
7.8 - High
- January 13, 2026
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Jan 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20946
7.8 - High
- January 13, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Out-of-bounds Read
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