CVE-2026-72956 in Office
Summary
by MITRE • 09/09/2026
Untrusted pointer dereference in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described involves an untrusted pointer dereception flaw within the core rendering engine of Microsoft Office PowerPoint, specifically affecting how the application handles external or dynamically loaded resources during document processing. This type of defect typically arises when the software fails to adequately validate memory addresses before attempting to access them, a classic instance of CWE-416: Use After Free or CWE-787: Out-of-bounds Write depending on the specific execution context. In this scenario, an attacker who has successfully tricked a user into opening a specially crafted PowerPoint file can trigger the flawed code path by embedding malicious objects or malformed metadata that cause the application to dereference a pointer pointing to invalid or controlled memory regions. The immediate technical consequence is not necessarily arbitrary code execution but rather a disruption of normal program flow, which often manifests as an access violation or segmentation fault leading to a crash.
The operational impact centers on information disclosure over a network, suggesting that the vulnerability may be leveraged in conjunction with other techniques such as cross-site scripting or server-side request forgery if PowerPoint is integrated into web-based viewing platforms like Office Online. Alternatively, it could imply that the memory corruption allows an attacker to read sensitive data from the local system's memory space and exfiltrate it via network requests initiated by the compromised process. This aligns with ATT&CK technique T1005: Data from Local System, where adversaries seek to gather information directly from a victim’s machine without direct user interaction beyond opening the file. The ability to disclose information remotely makes this particularly dangerous in enterprise environments where sensitive presentations containing proprietary data or personal identifiable information are frequently shared and viewed across organizational boundaries.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Organizations should immediately apply the latest security patches released by Microsoft, which typically include bounds checking and pointer validation fixes for these specific rendering components. Administrators should also enforce strict macro policies to prevent execution of potentially malicious scripts embedded within documents. Furthermore, deploying application whitelisting solutions can restrict PowerPoint from executing unauthorized network connections or accessing sensitive memory regions during runtime. Users must be educated on the risks of opening files from untrusted sources and utilizing protected view features that isolate document processing in a sandboxed environment. Continuous monitoring for anomalous outbound traffic originating from Office applications can also help detect exploitation attempts early, allowing incident response teams to contain potential data breaches before significant damage occurs.