CVE-2026-70322
Summary
by MITRE • 08/11/2026
Improper input validation in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical weakness in Microsoft Office PowerPoint's input validation mechanisms that enables unauthorized attackers to achieve local information disclosure. The flaw occurs when the application fails to properly validate user-supplied data during the processing of presentation files, creating an avenue for malicious actors to extract sensitive information from the target system. Such vulnerabilities typically arise from insufficient sanitization of input parameters within the file parsing routines that handle various PowerPoint document formats including pptx, ppsx, and potentially legacy formats.
The technical implementation of this vulnerability stems from inadequate boundary checking and data validation procedures within PowerPoint's file processing engine. When a maliciously crafted presentation file is opened or processed, the application does not sufficiently validate the structure and content of the input data, allowing attackers to manipulate specific fields or elements that trigger unintended information disclosure behaviors. This weakness aligns with common software security principles where improper input handling leads to information leakage vulnerabilities. The vulnerability can be categorized under CWE-20, which specifically addresses improper input validation in software systems.
From an operational perspective, this flaw poses significant risks to enterprise environments where PowerPoint is widely used for business presentations and collaborative work. Attackers can exploit this vulnerability by crafting specially designed presentation files that, when opened by unsuspecting users, trigger information disclosure mechanisms within the application. The disclosed information could include system paths, memory addresses, or other sensitive data that might aid in further exploitation attempts. This type of vulnerability is particularly concerning because it leverages social engineering tactics where users are tricked into opening seemingly benign presentation files.
The attack vectors for this vulnerability typically involve phishing campaigns where malicious presentation files are distributed through email attachments or compromised websites. Once a user opens the crafted file, the vulnerability is triggered during normal PowerPoint operations such as file parsing, rendering, or even simple file preview functions. This exploitation model fits within the broader ATT&CK framework under the technique of initial access through spearphishing attachments, where adversaries leverage familiar software applications to deliver malicious payloads.
Organizations should implement multiple layers of defense to mitigate this vulnerability effectively. The primary mitigation involves applying Microsoft's security patches and updates immediately upon release, as these typically address the root cause of input validation flaws in the affected software components. Additionally, implementing strict file access controls and user education programs can help reduce the risk of exploitation through social engineering attacks that rely on users opening malicious presentation files. Network-based protections such as email filtering systems and web proxies should be configured to block or quarantine suspicious presentation file attachments.
Security monitoring and incident response procedures should include detection of unusual PowerPoint file processing activities, particularly when users open files from external sources or when system resources are consumed unusually during presentation rendering operations. The vulnerability's impact extends beyond immediate information disclosure, as it can serve as a stepping stone for more sophisticated attacks including privilege escalation or lateral movement within compromised networks. Regular security assessments and penetration testing should specifically target input validation weaknesses in commonly used office applications to identify similar vulnerabilities across the enterprise environment. Organizations must also consider implementing application whitelisting policies that restrict execution of unauthorized PowerPoint files, particularly in high-risk operational areas where information disclosure could lead to significant business disruption or data breaches.