CVE-2026

Api.Msrc.Microsoft • September 8, 2026

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Released: Sep 8, 2026

Please see Common Vulnerability Scoring System for more information on the definition of these metrics.

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

The following table provides an exploitability assessment for this vulnerability at the time of original publication.

What privileges could be gained by an attacker who successfully exploited the vulnerability?

The attacker would be able to take over the mailboxes of all Exchange users, attackers can send emails, read emails, download attachments.

How could an attacker exploit this vulnerability?

An attacker authenticated to an affected Exchange server as a member of a highly privileged role group could send a specially crafted request over the network to bypass mailbox authorization checks. Successful exploitation could allow the attacker to access or modify another user's mailbox content without user interaction.

Bui Xuan Quang (buxu) with Ncsgroup.vn

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle .

Information published.

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Multiple CVEs Disclosed on September 8, 2026, Affecting Microsoft Products On September 8, 2026, multiple CVEs were disclosed affecting various Microsoft products, including SharePoint and Office. Key vulnerabilities include improper access controls, buffer overflows, and command injections, which could allow unauthorized code execution and information disclosure. CVE-2026-85880, noted for active exploitation, was added to CISA's KEV list on the same day. Other vulnerabilities, such as CVE-2026-69428 and CVE-2026-69621, also pose significant risks due to their potential for exploitation. Organizations using affected versions of Microsoft products are urged to apply patches immediately to mitigate risks. The vulnerabilities impact a range of systems, including SharePoint Server and Microsoft Office, and could lead to severe consequences if exploited. 927 sources 74

Extracted Entities

CVE-2026

The full story

Extracted Entities

Attack Types (1)

CWE Weaknesses (1)

Domains (1)

MITRE ATT&CK (1)

Platforms (1)