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 (CWE-502) in Microsoft Bing arises from improper handling of untrusted serialized data, enabling remote code execution by attackers over the network without privileges or user interaction. The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H reflects a critical remote attack surface with low attack complexity and no required privileges or user interaction, resulting in complete system compromise. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on affected Microsoft Bing systems, leading to full compromise of confidentiality, integrity, and availability. This could result in unauthorized control over the affected service or system components.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819 to remediate this vulnerability. Since this is not a cloud service, patching the affected software is required to mitigate the risk.
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-502) in Microsoft Bing arises from improper handling of untrusted serialized data, enabling remote code execution by attackers over the network without privileges or user interaction. The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H reflects a critical remote attack surface with low attack complexity and no required privileges or user interaction, resulting in complete system compromise. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on affected Microsoft Bing systems, leading to full compromise of confidentiality, integrity, and availability. This could result in unauthorized control over the affected service or system components.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819 to remediate this vulnerability. Since this is not a cloud service, patching the affected software is required to mitigate the risk.
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: 4/23/2026, 10:06:19 PM
Last enriched: 4/23/2026, 10:21:05 PM
Last updated: 4/24/2026, 12:35:48 PM
Views: 29
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.