CVE-2026-108455 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 flaw in the way the presentation software handles embedded objects and external references during file parsing operations. This issue stems from improper validation of input data within the core rendering engine, specifically when processing complex slide structures that contain linked media or OLE (Object Linking and Embedding) components. When an attacker crafts a malicious PowerPoint file containing specially designed elements, they can exploit this logic error to force the application to leak sensitive system information during the parsing process. The flaw is particularly insidious because it does not require user interaction beyond opening the document in certain viewing modes or preview panes, depending on the specific version and configuration of Microsoft Office involved.
From a technical perspective, the root cause lies in how PowerPoint resolves references to external resources such as images, audio files, or hyperlinks embedded within the presentation structure. The application fails to adequately sanitize these paths before attempting to access them, leading to an information disclosure scenario where internal file system structures, registry keys, or network configuration details are inadvertently exposed through error messages, debug logs, or memory dumps generated during the failed resolution attempt. This behavior aligns with CWE-200, which classifies vulnerabilities that expose sensitive information to unauthorized actors as Information Exposure. The vulnerability allows an attacker to gather reconnaissance data about the target environment without executing arbitrary code, thereby serving as a precursor step for more severe attacks such as remote code execution or privilege escalation.
The operational impact of this vulnerability is primarily centered around intelligence gathering and lateral movement preparation within enterprise environments. By exploiting this flaw, adversaries can map out network topologies, identify installed software versions, detect security tools running on the endpoint, and discover sensitive file paths that may contain credentials or proprietary data. This information significantly reduces the effort required for subsequent attack phases, as it provides a detailed blueprint of the target's defensive posture and asset inventory. In high-security environments where PowerPoint files are frequently exchanged between departments or with external partners, this vulnerability poses a persistent risk if users are not trained to recognize suspicious documents or if technical controls such as macro restrictions and application whitelisting are not strictly enforced.
Mitigation strategies must focus on both immediate patching and long-term architectural defenses. Organizations should immediately apply the latest security updates provided by Microsoft for all affected versions of Office, ensuring that the specific patches addressing this information disclosure flaw are installed across all endpoints. Beyond patch management, implementing application control policies such as Windows Defender Application Control or AppLocker can restrict PowerPoint from executing unauthorized scripts or accessing sensitive system areas. Additionally, deploying email gateway solutions capable of inspecting and sanitizing attachments before they reach end-users can prevent malicious files from entering the network perimeter. User awareness training remains critical; employees should be educated to avoid opening documents from untrusted sources and to report any unusual application behavior immediately. Regular vulnerability assessments and penetration testing focused on social engineering vectors will further help identify gaps in these defenses and ensure that the organization maintains a robust security posture against evolving threats targeting productivity software.