---
id: "CVE-2026-118157"
page: "https://infrastack.ai/live/CVE-2026-118157"
kind: "vulnerability"
aliases: ["CVE-2026-118157"]
title: "Microsoft Exchange Server: weak authentication lets an authorized user gain privileges"
severity: "high"
cvss: 7.2
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["exchange-server", "microsoft-exchange", "on-premises", "vendor"]
not_affected_if: ["exchange-online"]
published_at: "2026-11-10T19:19:37+00:00"
first_seen_at: "2026-11-10T19:24:49+00:00"
updated_at: "2026-11-10T19:47:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118157", "first_seen_at": "2026-11-10T19:24:49+00:00"}]
exploit_sources: []
---

# Microsoft Exchange Server: weak authentication lets an authorized user gain privileges

Link for people: https://infrastack.ai/live/CVE-2026-118157 (this .md is for agents)

Microsoft Exchange Server has weak authentication that lets an attacker who already holds a valid account over the network raise their privileges. The sources give no fixed version, no exploitation evidence, and no further technical detail.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-10T19:24:49+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118157

## From the sources

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

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_