Microsoft 365 Apps
Don't miss out!
Thousands of developers use stack.watch to stay informed.Get an email whenever new security vulnerabilities are reported in Microsoft 365 Apps.
By the Year
In 2026 there have been 79 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. If vulnerabilities keep coming in at the current rate, it appears that number of security vulnerabilities in 365 Apps in 2026 could surpass last years number. Last year, the average CVE base score was greater by 0.21
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 79 | 7.49 |
| 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
Jun 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-47293
7 - High
- June 09, 2026
Use after free in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45463
8.4 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Integer underflow
Jun 2026: Microsoft Excel Security Feature Bypass Vulnerability
CVE-2026-45459
3.3 - Low
- June 09, 2026
Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
Protection Mechanism Failure
Jun 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-45457
7.8 - High
- June 09, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Out-of-bounds Read
Jun 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-45455
3.3 - Low
- June 09, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
Out-of-bounds Read
Jun 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-44822
8.2 - High
- June 09, 2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
Out-of-bounds Read
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45645
7.8 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Jun 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-45643
7.8 - High
- June 09, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Jun 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-45466
3.3 - Low
- June 09, 2026
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Heap-based Buffer Overflow
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45461
8.4 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Jun 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-45460
4.7 - Medium
- June 09, 2026
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Buffer Over-read
Jun 2026: Microsoft Outlook and Word Remote Code Execution Vulnerability
CVE-2026-45458
8.4 - High
- June 09, 2026
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Jun 2026: Microsoft Outlook and Word Remote Code Execution Vulnerability
CVE-2026-45456
8.4 - High
- June 09, 2026
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
Object Type Confusion
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-44824
7.8 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
Jun 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-44823
7.8 - High
- June 09, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Numeric Truncation Error
Jun 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-44821
5.5 - Medium
- June 09, 2026
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Out-of-bounds Read
Jun 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-44820
7.8 - High
- June 09, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Out-of-bounds Read
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-44819
7.8 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
Jun 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-44818
7 - High
- June 09, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Race Condition
Jun 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-44817
7.8 - High
- June 09, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Object Type Confusion
Jun 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-45486
7.8 - High
- June 09, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Dangling pointer
Jun 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-45485
3.3 - Low
- June 09, 2026
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Out-of-bounds Read
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45474
8.4 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Jun 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-45471
7.8 - High
- June 09, 2026
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Untrusted Pointer Dereference
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45472
8.4 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Dangling pointer
Jun 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45475
7.8 - High
- June 09, 2026
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
Jun 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-45469
7.8 - High
- June 09, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Integer underflow
May 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-35436
8.8 - High
- May 12, 2026
Use after free in Microsoft Office 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-2026-40420
8.8 - High
- May 12, 2026
Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.
Authorization
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 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
Access of resource using incompatible type ('type confusion') 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
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
May 2026: Microsoft Outlook and Word Remote Code Execution Vulnerability
CVE-2026-40361
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 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
Heap-based buffer overflow 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
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
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
Access of resource using incompatible type ('type confusion') 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
May 2026: Windows Rich Text Edit Elevation of Privilege Vulnerability
CVE-2026-21530
6.7 - Medium
- May 12, 2026
Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally.
Double-free
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 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 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-2026-32198
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
Stay on top of Security Vulnerabilities
Want an email whenever new vulnerabilities are published for Microsoft 365 Apps or by Microsoft? Click the Watch button to subscribe.
