CVE-2026-33819: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft Bing
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-33819) in Microsoft Bing is caused by improper deserialization of untrusted data, classified under CWE-502. It enables remote code execution by an attacker over the network without requiring privileges or user interaction. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, scope changed, and high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on Microsoft Bing, leading to full compromise of confidentiality, integrity, and availability of the affected system or service. This can result in complete control over the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819 to remediate this vulnerability.
CVE-2026-33819: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft Bing
Description
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 10.0critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-33819) in Microsoft Bing is caused by improper deserialization of untrusted data, classified under CWE-502. It enables remote code execution by an attacker over the network without requiring privileges or user interaction. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, scope changed, and high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on Microsoft Bing, leading to full compromise of confidentiality, integrity, and availability of the affected system or service. This can result in complete control over the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-03-24T00:52:01.351Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819","vendor":"Microsoft"}]
Threat ID: 69ea97db87115cfb68681bb6
Added to database: 04/23/2026, 22:06:19 UTC
Last enriched: 06/19/2026, 17:14:38 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 344
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