CVSS 10.0CVSS 10.0 · CRITICAL

CVE-2026-33819

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

View on NVD

Severity

Score: 10.0(CRITICAL)

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

AV: NETWORK

AC: LOW

PR: NONE

UI: NONE

S: CHANGED

C: HIGH

I: HIGH

A: HIGH

Weakness (CWE): CWE-502

EPSS

Probability of exploitation (next 30 days): 0.0039 (0.4%)

Percentile: 60.2%

EPSS: 2026-05-06

Affects

microsoft:bing

Technical description

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

Published: 4/23/2026, 10:16:37 PM

Last modified: 5/5/2026, 2:15:20 PM

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819

How to read this card

Actively exploited

KEV (Known Exploited Vulnerabilities) is CISA's catalog of CVEs confirmed as actively exploited in the real world. If a CVE is on KEV, someone is already using it in attacks.

CVSS 10.0

CVSS 10.0 — máxima severidad teórica. Explotable de forma remota, sin privilegios, con impacto total. Aún no confirmada como explotada en el mundo real, pero parchea ya.

AI-recommended

Un modelo de lenguaje revisó el CVE y consideró que afecta a software ampliamente desplegado o herramientas comunes de desarrollo. Un humano del equipo aprobó la publicación antes de que llegara aquí.

EPSS — EPSS (Exploit Prediction Scoring System) by FIRST.org estimates the probability that a CVE will be exploited in the next 30 days. Range is 0 to 1; very fresh CVEs typically score low until evidence accumulates.