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By the Year

In 2026 there have been 173 vulnerabilities in Microsoft Office 365 with an average score of 7.0 out of ten. Office 365 did not have any published security vulnerabilities last year. That is, 173 more vulnerabilities have already been reported in 2026 as compared to last year.

Year Vulnerabilities Average Score
2026 173 7.02
2025 0 0.00
2024 0 0.00
2023 0 0.00
2022 0 0.00
2021 0 0.00
2020 0 0.00
2019 4 7.80
2018 1 7.80

It may take a day or so for new Office 365 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 Office 365 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 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-2026-68801 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 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 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 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 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 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-2026-64917 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 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 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 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 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 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 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 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 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

Aug 2026: Powerpoint Information Disclosure Vulnerability
CVE-2026-70322 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Powerpoint Information Disclosure Vulnerability
CVE-2026-70320 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-70319 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Powerpoint Information Disclosure Vulnerability
CVE-2026-70325 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-70314 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-70317 5.5 - Medium - August 11, 2026

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

Use of Uninitialized Resource

Aug 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-70318 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Powerpoint Information Disclosure Vulnerability
CVE-2026-70316 5.5 - Medium - August 11, 2026

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

Improper Input Validation

Aug 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-70315 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 PowerPoint Remote Code Execution Vulnerability
CVE-2026-70313 7.8 - High - August 11, 2026

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

Improper Input Validation

Aug 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-70310 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-2026-70311 7.8 - High - August 11, 2026

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Dangling pointer

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