What is CVE-2026-69558?

CVE-2026-69558 is a high-severity vulnerability in Microsoft Partner Center, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.6/10. Published 2026-08-20.

How severe is CVE-2026-69558?

High severity. CVSS v3 base score is 8.6 out of 10.

Auth bypass in Microsoft Partner Center

CVE-2026-69558

Authorization bypass through user-controlled key in Microsoft Partner Center allows an unauthorized attacker to disclose information over a network.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-08-20 · last modified 2026-08-25.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.7th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.010 · change: +0.004

Affected products

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

Microsoft Partner Center Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-69558?: CVE-2026-69558 is a high-severity vulnerability in Microsoft Partner Center, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.6/10. Published 2026-08-20.
How severe is CVE-2026-69558?: High severity. CVSS v3 base score is 8.6 out of 10.