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Vulnerability record · CVE-2026-33819 · published 23 April 2026

CVE-2026-33819: Microsoft bing deserialization of untrusted data vulnerability

Microsoft · Bing

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

9.8 CVSS 3.1 Critical EPSS 1.5% · top 26.2% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.1 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33819 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-32186Microsoft bing server-side request forgery (ssrf) vulnerabilityServer-side request forgery (ssrf) in Microsoft Bing allows an unauthorized attacker to elevate privileges over a network.EPSS 0.90%9.8CVE-2025-21355Microsoft bing missing authentication for critical function vulnerabilityMissing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a networkEPSS 1.7%7.5CVE-2026-26120Microsoft bing server-side request forgery (ssrf) vulnerabilityServer-side request forgery (ssrf) in Microsoft Bing allows an unauthorized attacker to perform tampering over a network.EPSS 0.80%6.8CVE-2014-1670Microsoft bing code injection vulnerabilityThe Microsoft Bing application before 4.2.1 for Android allows remote attackers to install arbitrary APK files via vectors involving a crafted DNS re…EPSS 14%6.5CVE-2020-1329Microsoft bing authentication bypass by spoofing vulnerabilityA spoofing vulnerability exists when Microsoft Bing Search for Android improperly handles specific HTML content, aka 'Microsoft Bing Search Spoofing …EPSS 2.6%4.7CVE-2021-33753Microsoft bing vulnerabilityMicrosoft Bing Search Spoofing VulnerabilityEPSS 1.9%4.3CVE-2026-45650Microsoft bing vulnerabilityUser interface (ui) misrepresentation of critical information in Microsoft Bing allows an unauthorized attacker to perform spoofing over a network.EPSS 0.70%9.8CVE-2021-23758Ajax.NET Professional ajaxpro.2 untrusted deserialization RCEAll versions of the ajaxpro.2 package (Ajax.NET Professional) deserialize untrusted data and permit deserialization of arbitrary .NET classes. That l…KEVEPSS 83%analysed

Source: NIST National Vulnerability Database (record CVE-2026-33819), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.