CVE-2026-69621 Role: Windows Fax Service Elevation of Privilege Vulnerability

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.

Heap-based buffer overflow in Windows Fax Service allows an authorized attacker to elevate privileges locally.

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?

An attacker could use this vulnerability to elevate privileges from Medium Integrity Level to Local Service.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system. Successful exploitation is not guaranteed and depends on a combination of factors that might include the environment, system configuration, and the presence of additional security measures.

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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-2026-69621 Role: Windows Fax Service Elevation of Privilege Vulnerability

The full story

Extracted Entities

CVEs (1)

CWE Weaknesses (1)

MITRE ATT&CK (1)

Platforms (1)