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By the Year

In 2026 there have been 247 vulnerabilities in Microsoft 365 Apps with an average score of 7.2 out of ten. Last year, in 2025 365 Apps had 154 security vulnerabilities published. That is, 93 more vulnerabilities have already been reported in 2026 as compared to last year. Last year, the average CVE base score was greater by 0.51




Year Vulnerabilities Average Score
2026 247 7.19
2025 154 7.70
2024 42 7.69
2023 56 7.44
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

Aug 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-70105 6.5 - Medium - August 20, 2026

Improper input validation in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

Improper Input Validation

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-70130 8.4 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68817 7.8 - High - August 11, 2026

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

Stack Overflow

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68814 7.8 - High - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68812 7.8 - High - August 11, 2026

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

Heap-based Buffer Overflow

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68805 7.8 - High - August 11, 2026

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

Heap-based Buffer Overflow

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68804 7.8 - High - August 11, 2026

Numeric truncation error in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Numeric Truncation Error

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68803 7.8 - High - August 11, 2026

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Object Type Confusion

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68801 7.8 - High - August 11, 2026

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

Heap-based Buffer Overflow

Aug 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-68799 5.5 - Medium - August 11, 2026

Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Use of Uninitialized Resource

Aug 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-68798 7.8 - High - August 11, 2026

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

Heap-based Buffer Overflow

Aug 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-68797 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Graphics Component Information Disclosure Vulnerability
CVE-2026-66809 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-66810 5.5 - Medium - August 11, 2026

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Office Graphics Component Remote Code Execution Vulnerability
CVE-2026-66807 7.8 - High - August 11, 2026

Stack-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Stack Overflow

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-66806 5.5 - Medium - August 11, 2026

Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

off-by-five

Aug 2026: Microsoft Outlook Spoofing Vulnerability
CVE-2026-62882 4.3 - Medium - August 11, 2026

Insufficiently protected credentials in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Insufficiently Protected Credentials

Aug 2026: Microsoft Access Remote Code Execution Vulnerability
CVE-2026-64919 7.8 - High - August 11, 2026

Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Stack Overflow

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-64917 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Access Remote Code Execution Vulnerability
CVE-2026-64920 7.8 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Access Remote Code Execution Vulnerability
CVE-2026-64914 7.8 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-64915 7.8 - High - August 11, 2026

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

Heap-based Buffer Overflow

Aug 2026: Microsoft Access Remote Code Execution Vulnerability
CVE-2026-64908 7.8 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-64911 7.8 - High - August 11, 2026

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.

Integer Overflow or Wraparound

Aug 2026: Microsoft Access Remote Code Execution Vulnerability
CVE-2026-64912 7.8 - High - August 11, 2026

Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Stack Overflow

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-64909 7.8 - High - August 11, 2026

Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.

Integer underflow

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-64910 7.8 - High - August 11, 2026

Untrusted pointer dereference in Microsoft Office allows an unauthorized attacker to execute code locally.

Untrusted Pointer Dereference

Aug 2026: Microsoft Access Remote Code Execution Vulnerability
CVE-2026-64906 7.8 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-64907 7.8 - High - August 11, 2026

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Stack Overflow

Aug 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-64905 7.8 - High - August 11, 2026

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Buffer Over-read

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-64904 7.8 - High - August 11, 2026

Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.

Object Type Confusion

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-64899 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-64903 7.8 - High - August 11, 2026

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.

Integer Overflow or Wraparound

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-64898 7.8 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-63533 7.8 - High - August 11, 2026

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Heap-based Buffer Overflow

Aug 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-63532 7.8 - High - August 11, 2026

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.

Integer Overflow or Wraparound

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-63530 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-63531 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-63527 7.8 - High - August 11, 2026

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Stack Overflow

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-63529 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Graphics Component Remote Code Execution Vulnerability
CVE-2026-63526 7.8 - High - August 11, 2026

Stack-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Stack Overflow

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-63528 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Word Remote Code Execution Vulnerability
CVE-2026-63525 7.8 - High - August 11, 2026

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Numeric Truncation Error

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-63524 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Graphics Component Information Disclosure Vulnerability
CVE-2026-62842 5.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-58651 7.8 - High - August 11, 2026

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

Heap-based Buffer Overflow

Aug 2026: Microsoft Outlook Remote Code Execution Vulnerability
CVE-2026-70329 8.8 - High - August 11, 2026

Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Integer Overflow or Wraparound

Aug 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-70328 6.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-70327 6.5 - Medium - August 11, 2026

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

Out-of-bounds Read

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-70323 5.5 - Medium - August 11, 2026

Improper input validation in Microsoft Office allows an unauthorized attacker to disclose information locally.

Improper Input Validation

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