What is CVE-2026-88131?

CVE-2026-88131 is a critical-severity vulnerability in Microsoft Dataverse, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-10-08.

How severe is CVE-2026-88131?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Microsoft Dataverse

CVE-2026-88131

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

Vulnerability class: Insecure Deserialization

Published 2026-10-08 · last modified 2026-10-09.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Microsoft Dataverse

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88131 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-88131?: CVE-2026-88131 is a critical-severity vulnerability in Microsoft Dataverse, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-10-08.
How severe is CVE-2026-88131?: Critical severity. CVSS v3 base score is 9.8 out of 10.