CVE-2026-69734: microsoft 365_apps Integer Overflow or Wraparound

Vulnerability summary

CVE-2026-69734 is a medium (CVSS 6.5) Integer Overflow or Wraparound vulnerability in microsoft 365_apps. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.7% of scored vulnerabilities.

Timeline

1. 08-09-2026
   PublishedVulnerability first disclosed.
2. 14-10-2026
   Last modifiedVulnerability information updated.

Description

Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.