What is CVE-2026-26147?

CVE-2026-26147 is a high-severity vulnerability in Microsoft Azure Stack Hci, classified under Improper Input Validation. CVSS score: 7.7/10. Published 2026-05-22.

How severe is CVE-2026-26147?

High severity. CVSS v3 base score is 7.7 out of 10.

Improper input validation in Microsoft Azure Stack Hci

CVE-2026-26147

Improper input validation in Azure Compute Gallery allows an authorized attacker to disclose information over a network.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-05-22 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.005

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

Azure Stack HCI Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-26147?: CVE-2026-26147 is a high-severity vulnerability in Microsoft Azure Stack Hci, classified under Improper Input Validation. CVSS score: 7.7/10. Published 2026-05-22.
How severe is CVE-2026-26147?: High severity. CVSS v3 base score is 7.7 out of 10.