CVE-2026-21259
7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: secure@microsoft.com (Secondary)
Description
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.
Affected (11)
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| All versions | |
| Version 2016 | |
| Version 2019 | |
| Version 2021 | |
| Before 16.0.10417.20097 |
Related CWEs
CWE-122
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().
CWE-787
Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.
References (1)
Source: secure@microsoft.com
Vendor Advisory
Timeline
No history available yet.