PT-2026-34761 · Microsoft · Bing

Published 2026-04-23 · Updated 2026-05-12 · CVE-2026-33819

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Microsoft Bing (affected versions not specified)

Description Deserialization of untrusted data allows an unauthorized attacker to execute code over a network. Deserialization is the process of converting data from a format like JSON or XML back into an object that a program can use.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

BDU:2026-06878

CVE-2026-33819

Affected Products

Bing

References · 11

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06878 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33819 · Security Note
• https://twitter.com/windowsforum/status/2047490233327878178 · Twitter Post
• https://twitter.com/lyrie_ai/status/2054057831431548944 · Twitter Post
• https://twitter.com/CVEnew/status/2048168381413794080 · Twitter Post
• https://t.me/cveNotify/162185 · Telegram Post
• https://twitter.com/OrizonCyber/status/2047473119615435087 · Twitter Post
• https://twitter.com/lyrie_ai/status/2054057830571815303 · Twitter Post
• https://twitter.com/vuldb/status/2047548395586486414 · Twitter Post
• https://twitter.com/lyrie_ai/status/2054057829724516508 · Twitter Post