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CRITICAL severity

CVE-2026-88131 — Microsoft

CRITICAL

CVE-2026-88131 is a critical-severity (CVSS 9.8) Deserialization of Untrusted Data vulnerability. No vendor fix is recorded yet; mitigation options are listed below.

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

Published
Updated
Affected
—
Patched
—
Exploits
None indexed
Exploitation data as of Oct 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

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

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2026-88131 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

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