CVE-2026-55039CWE-122CWE-191

Microsoft Excel Remote Code Execution Vulnerability

High · published July 14, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
39.4
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00466 · 39.4th percentile
Weaknesses
CWE-122 · Heap-based Buffer Overflow; CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-07-14T17:08Z
EPSS history
Timeline
  • 14 JUL 17:08Z
    Microsoft Excel Remote Code Execution Vulnerability
    cvelistv5