CVE-2026-33819: Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.

CVE-2026-33819 · Severity: critical · CVSS 10 · Published 2026-04-23

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

Technologies: Microsoft Bing. Vendors: Microsoft.

Quick answers

Is CVE-2026-33819 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33819 being exploited in the wild.
How severe is CVE-2026-33819?
Critical severity, with a CVSS score of 10, published 23 April 2026.
Which products and versions are affected?
Microsoft Bing. The advisory does not name versions.
Is there a fix for CVE-2026-33819?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33819?
Check whether you run Microsoft Bing. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Bing

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