What is CVE-2026-77909?

CVE-2026-77909 is a high-severity vulnerability in Microsoft Azure Cyclecloud, classified under Insufficiently Protected Credentials. CVSS score: 7.7/10. Published 2026-09-08.

How severe is CVE-2026-77909?

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

Vulnerability in Microsoft Azure Cyclecloud

CVE-2026-77909

Insufficiently protected credentials in Azure CycleCloud allows an authorized attacker to disclose information over a network.

Published 2026-09-08 · last modified 2026-09-29.

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: 0.006 (47.0th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.006 · change: -0.003

Affected products

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

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

Frequently asked questions

What is CVE-2026-77909?: CVE-2026-77909 is a high-severity vulnerability in Microsoft Azure Cyclecloud, classified under Insufficiently Protected Credentials. CVSS score: 7.7/10. Published 2026-09-08.
How severe is CVE-2026-77909?: High severity. CVSS v3 base score is 7.7 out of 10.