CVE-2026-33819 Microsoft Bing Remote Code Execution Vulnerability
An unauthorized attacker can execute arbitrary code remotely via deserialization of untrusted data in Microsoft Bing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33819?
CVE-2026-33819 is a critical unsafe deserialization vulnerability in Microsoft Bing, published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
Weakness: CWE-502
Which versions are affected by CVE-2026-33819?
It affects 1 product.
Products include Microsoft Bing.
How do I fix CVE-2026-33819?
No fix has been published for CVE-2026-33819 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-33819 being exploited?
There is no known exploitation of CVE-2026-33819 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Bing
Sources
Also known as GHSA-97j9-4xhc-69qj.