CVE-2026-88131 Microsoft Dataverse - Insecure Deserialization

Microsoft Dataverse contains an insecure deserialization vulnerability caused by deserialization of untrusted data, letting unauthorized attackers execute code remotely, exploit requires network access.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.84% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Insecure Deserialization
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-502

Vendor fix

Update to the latest version of Microsoft Dataverse.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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