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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.

Severity
Critical
Impact
Remote Code Execution
CVSS
10.0 base · 8.7 temporal
Release
2026-04-23
Signals
Microsoft Bing Remote Code Execution Exploited: No Publicly disclosed: No Exploitability: N/A
CWE
CWE-502: Deserialization of Untrusted Data
Patch Diff
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Resolved binary override
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Description
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
FAQ / Articles
Microsoft Bing Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
Microsoft Bing Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
FAQ
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.