CVE-2026-33819CWE-502

Microsoft Bing Remote Code Execution Vulnerability

Critical · published April 23, 2026

CVSS v3.1

10.0

EPSS

2%

Percentile

74.6

In the wild

Unconfirmed

What it is

Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.

The record

Technical detail

CVSS v3.1: 10.0 · CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0: Not supplied
EPSS: 0.01532 · 74.6th percentile
Weakness: CWE-502 · Deserialization of Untrusted Data
Published: 2026-04-23T21:35Z

EPSS history

Timeline

23 APR 21:35Z
Microsoft Bing Remote Code Execution Vulnerability
cvelistv5