CVE-2026-69678 in Office
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 involves a use-after-free error within the Microsoft Office PowerPoint application, specifically affecting its ability to process certain document structures or embedded objects. This class of memory corruption flaw occurs when software continues to use a pointer after it has been freed from memory, leading to undefined behavior that can be exploited by an attacker. In this specific instance, the vulnerability is triggered through network-based interactions, meaning that a remote attacker does not need physical access or local authentication on the target system but rather relies on delivering a maliciously crafted PowerPoint file via email, shared drives, or other network vectors. The core technical flaw lies in how PowerPoint manages memory allocation and deallocation for specific components responsible for rendering slides, animations, or embedded media. When an attacker crafts a document with malformed data structures that cause the application to release a block of memory prematurely while retaining references to it, subsequent operations on those stale pointers can lead to arbitrary code execution.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow attackers to manipulate heap metadata or overwrite adjacent objects in memory. By carefully controlling the contents of the freed memory region through further interactions with the application, an attacker can achieve control over critical program flow, such as function pointers or return addresses on the stack. This capability enables the execution of arbitrary code under the context of the currently logged-in user. Since PowerPoint is a widely used productivity tool often configured to open files from untrusted sources like email attachments without sufficient sandboxing in older versions, this vulnerability presents a significant risk for drive-by attacks and targeted spear-phishing campaigns. The network aspect implies that the attack vector could involve hosting a malicious file on a web server or sending it directly via SMTP, relying on social engineering to persuade users into opening the document.
The operational impact of successfully exploiting this vulnerability is severe, resulting in full system compromise at the user level. An attacker who exploits this flaw can install programs, view, change, or delete data, and create new accounts with full user rights. If the affected application runs with elevated privileges on a network server or domain controller, the consequences are even more critical, potentially allowing complete control over the operating system and enabling lateral movement within an enterprise environment. This aligns closely with Common Weakness Enumeration (CWE) category CWE-416, which defines use-after-free as a distinct memory safety violation. Furthermore, in terms of offensive security frameworks like MITRE ATT&CK, this vulnerability facilitates techniques associated with Initial Access through Spearphishing Attachment and Execution via User Interaction, often leading to Privilege Escalation if the user context is not restricted by modern application isolation features such as Protected View or sandboxing mechanisms introduced in later versions of Office.
Mitigation strategies for this vulnerability primarily involve applying vendor-supplied security patches that address the memory management logic within PowerPoint's rendering engine and object handling routines. Organizations should ensure that all endpoints running Microsoft Office are updated to the latest cumulative updates provided by Microsoft, which typically include fixes for such high-severity remote code execution flaws. Additionally, implementing application control policies can restrict the execution of untrusted scripts or macros often used in conjunction with these exploits. Users should be educated on recognizing suspicious email attachments and avoiding opening documents from unknown sources. Enabling Protected View, a default security feature in modern Office versions that opens files in a sandboxed environment before allowing full editing capabilities, significantly reduces the risk of exploitation by preventing direct interaction between potentially malicious content and the host system's memory space until explicit user approval is granted.