A deserialization vulnerability in Microsoft Bing allows an unauthorized remote attacker to execute arbitrary code via the network.
Description
A deserialization vulnerability in Microsoft Bing allows an unauthorized remote attacker to execute arbitrary code via the network.
AI Analyst Comment
Remediation
Update Microsoft Bing allows to the latest version. Check vendor security advisory for specific patch details. Monitor for exploitation attempts and review access logs.
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VENDOR: Microsoft
PRODUCT: Bing
AFFECTED_VERSIONS: See vendor advisory
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Description Summary:
A deserialization vulnerability in Microsoft Bing allows an unauthorized remote attacker to execute arbitrary code via the network.
Executive Summary:
A critical deserialization flaw in Microsoft Bing permits unauthenticated remote attackers to execute arbitrary code, creating a significant risk of full system compromise.
Vulnerability Details
CVE-ID: CVE-2026-33819
Affected Software: Microsoft Bing
Affected Versions: See vendor advisory for specific affected versions
Vulnerability: The vulnerability stems from insecure deserialization of untrusted data handled by the application. This allows an unauthorized attacker to inject malicious payloads that execute code within the context of the service.
Business Impact
A CVSS score of 10.0 reflects the maximum severity, indicating that this vulnerability could lead to a total breach of the affected infrastructure. Successful exploitation may result in complete loss of data confidentiality, integrity, and system availability.
Remediation Plan
Immediate Action: Apply the latest security updates provided by Microsoft for the Bing service immediately.
Proactive Monitoring: Review network traffic and server logs for unusual deserialization patterns or unexpected process execution following data ingestion.
Compensating Controls: Utilize a Web Application Firewall (WAF) to filter malicious input and restrict network access to the affected service components.
Exploitation Status
Public Exploit Available: No
Analyst Notes: As of Apr 23, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.
Analyst Recommendation
Given the critical nature of this vulnerability and its 10.0 CVSS score, immediate patching is required to prevent remote code execution. Security teams should verify that all instances of the affected software are updated to the vendor-recommended versions without delay.