CVE-2026-108453 in Office PowerPoint
Summary
by MITRE • 10/16/2026
Microsoft Office PowerPoint Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified as Microsoft Office PowerPoint Information Disclosure represents a critical flaw in the way certain versions of Microsoft PowerPoint handle specific file formats and embedded objects during rendering or parsing operations. This security issue stems from improper validation of input data, allowing an attacker to craft maliciously formatted files that exploit weaknesses in memory management or object handling routines within the application. When a user opens such a specially crafted presentation file, whether through direct interaction or automated processing by document scanning services, the software fails to properly sanitize or isolate sensitive information contained within the file structure. This failure results in the unintended exposure of internal system states, metadata, or potentially confidential data that was not meant for external visibility during standard viewing operations.
From a technical perspective, this flaw is categorized under CWE-200 as an Information Exposure vulnerability, specifically relating to the leakage of sensitive information through error messages, debug output, or improper access controls within the application logic. The root cause often involves insufficient separation between trusted and untrusted data sources when processing complex PowerPoint elements such as embedded OLE objects, macros, or specific XML-based components inherent in modern Office file formats like .pptx. Attackers can leverage this weakness to extract internal paths, version numbers, user credentials cached locally by the application, or other contextual details that aid in further reconnaissance and targeted attacks against the victim organization. The vulnerability does not necessarily require code execution but serves as a powerful vector for intelligence gathering, which is often a precursor to more severe exploits such as remote code execution or privilege escalation.
The operational impact of this information disclosure is significant within enterprise environments where Microsoft Office products are ubiquitous. By exploiting this flaw, an adversary can gain valuable insights into the target's infrastructure, including software versions, installed patches, and potentially internal network configurations if the application interacts with local resources during file parsing. This intelligence allows attackers to tailor subsequent attacks more effectively, bypassing security controls that might otherwise detect generic exploit attempts. Furthermore, in scenarios where PowerPoint is used for automated document processing or integrated into collaboration platforms like Microsoft Teams or SharePoint, the vulnerability can be triggered remotely without any user interaction beyond opening a shared link or viewing a preview thumbnail, thereby increasing the attack surface significantly and facilitating large-scale reconnaissance campaigns against organizational assets.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements to prevent similar information leakage incidents. The primary defense is to apply the latest security updates provided by Microsoft, which address these parsing flaws through enhanced input validation and stricter sandboxing of Office applications. Organizations should also enforce strict policies regarding the opening of files from untrusted sources, utilizing application whitelisting or controlled folder access features available in modern Windows operating systems to restrict PowerPoint's ability to write or read sensitive data outside its designated directories. Additionally, implementing network-level filtering solutions that inspect and sanitize incoming documents before they reach end-user devices can reduce exposure. Regular security awareness training for employees is also crucial to ensure they recognize the risks associated with opening unexpected files, thereby adding a human layer of defense against social engineering tactics often used in conjunction with such vulnerabilities.
In alignment with industry frameworks, this vulnerability maps directly to MITRE ATT&CK technique T1005, which describes Data from Local System Retrieval, as it involves gathering information about the system environment without direct execution privileges. It also relates to T1083, File and Directory Discovery, if the disclosed information includes paths or structural details of the local file system accessed during parsing. Security teams should prioritize patching these endpoints promptly while monitoring for anomalous behavior indicative of exploitation attempts, such as unusual memory access patterns by PowerPoint processes or unexpected network connections initiated during document opening events. Continuous vulnerability management programs must include regular assessments of Office application configurations to ensure that macro settings and trusted locations are configured securely, minimizing the potential impact of information disclosure flaws like this one.