What is CVE-2026-83943?

CVE-2026-83943 is a high-severity vulnerability in Microsoft Azure API Center, classified under Information Disclosure. CVSS score: 8.7/10. Published 2026-10-08.

How severe is CVE-2026-83943?

High severity. CVSS v3 base score is 8.7 out of 10.

Information disclosure in Microsoft Azure API Center

CVE-2026-83943

Exposure of sensitive information to an unauthorized actor in Azure API Center allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Information Disclosure

Published 2026-10-08 · last modified 2026-10-09.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Microsoft Azure API Center

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83943 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-83943?: CVE-2026-83943 is a high-severity vulnerability in Microsoft Azure API Center, classified under Information Disclosure. CVSS score: 8.7/10. Published 2026-10-08.
How severe is CVE-2026-83943?: High severity. CVSS v3 base score is 8.7 out of 10.