MSRC-CVE-2026-33819 — Microsoft Bing Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited. Customer action: Not required.

Details

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Vulnerabilities 1

Critical 10.0

CVE-2026-33819

Microsoft Bing Remote Code Execution Vulnerability

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

Microsoft Microsoft Bing

Apr 23, 2026

Revision history

2026-04-23 #1
Information published.

References

CVE-2026-33819 Microsoft Bing Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss