What is CVE-2026-59124?

CVE-2026-59124 is a critical-severity vulnerability in Microsoft Windows App Client For Desktop, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-08-11.

How severe is CVE-2026-59124?

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

Deserialization in Microsoft Windows App Client For Desktop

CVE-2026-59124

Deserialization of untrusted data in Microsoft High Performance Computing (HPC) Pack allows an unauthorized attacker to execute code over a network.

Vulnerability class: Insecure Deserialization

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.

Affected products

Microsoft Windows App Client For Desktop — versions 1.00

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-59124?: CVE-2026-59124 is a critical-severity vulnerability in Microsoft Windows App Client For Desktop, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-08-11.
How severe is CVE-2026-59124?: Critical severity. CVSS v3 base score is 9.8 out of 10.