What is CVE-2026-118157?

CVE-2026-118157 is a high-severity vulnerability in Microsoft Exchange Server Subscription Edition Rtm, classified under Weak Authentication. CVSS score: 7.2/10. Published 2026-11-10.

How severe is CVE-2026-118157?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Microsoft Exchange Server Subscription Edition Rtm

CVE-2026-118157

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Published 2026-11-10 · last modified 2026-11-10.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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 Exchange Server Subscription Edition Rtm

Weakness classification (CWE)

CWE-1390 — Weak Authentication

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118157 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-118157?: CVE-2026-118157 is a high-severity vulnerability in Microsoft Exchange Server Subscription Edition Rtm, classified under Weak Authentication. CVSS score: 7.2/10. Published 2026-11-10.
How severe is CVE-2026-118157?: High severity. CVSS v3 base score is 7.2 out of 10.