Oct 2026: Microsoft Office SharePoint Remote Code Execution Vulnerability
CVE-2026-88163 Published on October 13, 2026
Microsoft Office SharePoint Remote Code Execution Vulnerability
Integer overflow or wraparound in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Weakness Types
Integer Overflow or Wraparound
The software 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 can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound 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 wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-88163
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Affected Versions
Microsoft SharePoint Server Subscription Edition:- Version 16.0.0 and below 16.0.20326.20190 is affected.