CVE-2026-33819
Microsoft Bing Remote Code Execution Vulnerability
CVE-2026-33819 is a critical vulnerability (CVSS 10.0) in Microsoft Bing, published April 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.84%, the 58th percentile. No source names a fixed version.
- Severity
- 10.0 CriticalCVSS 3.1, CVE List
- Exploit chance
- 0.84%EPSS, 58th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Affected products
What each source reports
CVE List Score used
Microsoft Bing Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-33819- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-502
- Updated
- 2026-11-02
EUVDEUVD-2026-25311
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-25311- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-97j9-4xhc-69qj
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute...
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
- Record
GHSA-97j9-4xhc-69qj- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
NVD
Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-33819- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.