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.

Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

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

Are the updates for the Microsoft Office LTSC for Mac currently available?

The security update for Microsoft Office LTSC for Mac 2021 and 2024 are not immediately available. The updates will be released as soon as possible, and when they are available, customers will be notified via a revision to this CVE information.

Is the Preview Pane an attack vector for this vulnerability?

No, the Preview Pane is not an attack vector.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?

An attacker must send a user a malicious Office file and convince them to open it.

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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

CVE-2026

The full story

Extracted Entities

CWE Weaknesses (1)

MD5 Hashes (1)