CVE-2026-55949CWE-908

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

Use of uninitialized resource 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
Weakness
CWE-908 · Use of Uninitialized Resource
Published
2026-07-14T17:09Z
EPSS history
Timeline
  • 14 JUL 17:09Z
    Microsoft Excel Remote Code Execution Vulnerability
    cvelistv5