CVE-2026-108454 in Office
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 security flaw within the presentation software component of the Microsoft Office suite, specifically affecting how certain file formats are processed and rendered by the application engine. This issue stems from an improper handling of specific data structures or metadata embedded within PowerPoint files, particularly those utilizing older binary formats such as .ppt or early versions of the Open XML format (.pptx). When a user opens a specially crafted presentation file containing maliciously constructed objects, linked media, or hidden layers, the application fails to properly sanitize or isolate this content before rendering it in memory. This lack of rigorous input validation allows an attacker to manipulate internal state variables or expose sensitive data structures that are not intended for public access during normal operation. The root cause lies in the complex parsing logic required to support backward compatibility with legacy file formats, where edge cases involving malformed headers or unexpected object types can trigger unintended information retrieval routines rather than standard error handling protocols.
From a technical perspective, this vulnerability is classified under CWE-200 as an Information Exposure Vulnerability, specifically falling into subcategories related to exposure of sensitive information through error messages or improper access controls within the application logic. The exploitation mechanism typically involves crafting a PowerPoint file that triggers a specific code path where internal variables containing user credentials, document properties, cached network paths, or even previously deleted content fragments are written to temporary files or exposed via debug interfaces left active in certain build configurations. In some instances, this may manifest as an out-of-bounds read operation that leaks memory contents adjacent to the intended buffer, providing attackers with a glimpse into the application's internal state. This is not merely a display issue but a fundamental breach of data confidentiality within the local execution environment, potentially revealing configuration details or user-specific artifacts stored in temporary directories during the rendering process.
The operational impact of this vulnerability extends beyond simple curiosity-driven information gathering; it serves as a significant reconnaissance vector for subsequent attacks. By extracting sensitive metadata such as author names, company domains, internal server paths referenced by linked objects, or cached authentication tokens, an attacker can gain valuable intelligence about the target organization's infrastructure and personnel structure. This contextual data facilitates social engineering campaigns, targeted phishing efforts, or further network penetration attempts where knowledge of specific software versions, patch levels, or internal naming conventions reduces the noise required for successful exploitation. Furthermore, if the disclosed information includes cached credentials or session tokens stored in memory by the Office suite, it could lead to unauthorized access to other corporate resources that rely on single sign-on mechanisms or shared credential stores. The risk is exacerbated when users are accustomed to opening files from untrusted sources without realizing that even viewing a file can trigger this disclosure mechanism before any macro execution occurs.
Mitigation strategies for this vulnerability require both immediate technical controls and long-term architectural adjustments. Organizations should immediately apply the latest security updates provided by Microsoft, which typically include patches that enforce stricter input validation and sanitize metadata extraction routines within the PowerPoint rendering engine. In environments where patching is not immediately feasible, deploying application whitelisting solutions can prevent unauthorized or untrusted PowerPoint files from being opened entirely. Additionally, disabling automatic content loading for linked objects and media in trusted locations reduces the attack surface by preventing the parsing of external resources that might trigger the vulnerability. Users should be educated to exercise caution when opening presentations received via email or downloaded from the internet, particularly those with unexpected file extensions or suspiciously named files. Enabling Protected View as a default setting for all Office documents opened from potentially unsafe locations ensures that content is rendered in a sandboxed environment where memory access and system interactions are restricted, thereby neutralizing the information disclosure vector before it can impact the host system's security posture.