CVE-2026-45503

CVE-2026-45503

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-45503?: CVE-2026-45503 is a high-severity vulnerability, classified under Improper Authorization. CVSS score: 8.1/10. Published 2026-06-09.
How severe is CVE-2026-45503?: High severity. CVSS v3 base score is 8.1 out of 10.