CVE-2026-69797 in Office 365 Apps for Enterprise
Summary
by MITRE • 09/09/2026
Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described constitutes a critical security flaw within the Microsoft Office PowerPoint application, specifically involving a use-after-free condition that can be exploited by an unauthorized attacker to achieve remote code execution over a network. This type of vulnerability arises from improper memory management practices where software continues to reference a pointer after the memory it points to has been freed or deallocated. In the context of PowerPoint, this typically occurs when processing specially crafted files or content embedded within presentations that trigger specific rendering or parsing routines. When an attacker crafts a malicious document designed to exploit this flaw, they can manipulate the application's internal state such that a pointer remains valid in memory even after the underlying object has been destroyed. Subsequent operations on this dangling pointer allow for arbitrary read and write access to system memory, which serves as the foundational step for executing arbitrary code with the privileges of the currently logged-in user.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they bypass many traditional security controls that rely on preventing direct execution from data segments. By controlling the contents of freed memory or manipulating heap structures through subsequent allocations, an attacker can redirect program flow to shellcode injected into the process space. This capability transforms what might otherwise be a denial-of-service condition into a full remote code execution vector. The network aspect implies that this vulnerability is likely triggered by opening a malicious file received via email, downloaded from a website, or accessed through shared drives without requiring any additional user interaction beyond opening the document itself. Such scenarios are common in targeted phishing campaigns where social engineering is used to persuade users into viewing compromised presentations.
The operational impact of this vulnerability is severe, as it grants an attacker complete control over the affected system. Once code execution is achieved, the adversary can install programs, view, change, or delete data, and create new accounts with full user rights. If the vulnerable application runs with elevated privileges, such as administrator access, the compromise extends to the entire network infrastructure. Attackers often leverage this initial foothold for lateral movement, privilege escalation, and persistence mechanisms like installing backdoors or modifying startup scripts. The ability to execute code remotely makes this a high-priority threat requiring immediate attention from security operations teams monitoring for indicators of compromise associated with exploit kits targeting Microsoft Office applications.
Mitigation strategies must focus on both technical controls and user awareness. Organizations should ensure that all systems running affected versions of Microsoft PowerPoint are updated with the latest security patches released by Microsoft, as these updates typically include fixes to the memory management routines responsible for handling object lifecycles correctly. Additionally, deploying application whitelisting solutions can prevent unauthorized or untrusted scripts from executing within Office applications, thereby neutralizing many exploitation attempts even if the underlying vulnerability is present. Network segmentation and strict email filtering policies further reduce the attack surface by limiting exposure to potentially malicious documents. Users should be trained to exercise caution when opening files from unknown sources and to verify the authenticity of attachments before viewing them. Regular auditing of software inventory helps ensure that legacy versions lacking these critical fixes are identified and remediated promptly, maintaining a robust defense posture against memory corruption exploits.