What is CVE-2025-59273?

CVE-2025-59273 is a high-severity vulnerability in Microsoft Azure Event Grid, classified under Improper Access Control. CVSS score: 7.3/10. Published 2025-10-23.

How severe is CVE-2025-59273?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Microsoft Azure Event Grid

CVE-2025-59273

Improper access control in Azure Event Grid allows an unauthorized attacker to elevate privileges over a network.

Published 2025-10-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (29.6th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59273 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-59273?: CVE-2025-59273 is a high-severity vulnerability in Microsoft Azure Event Grid, classified under Improper Access Control. CVSS score: 7.3/10. Published 2025-10-23.
How severe is CVE-2025-59273?: High severity. CVSS v3 base score is 7.3 out of 10.