CVE-2026-50665 in Office
Summary
by MITRE • 07/14/2026
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical out-of-bounds read flaw within Microsoft Office applications that enables unauthorized attackers to extract sensitive information from local systems. The technical implementation involves improper input validation and memory management practices where the affected Office components fail to properly bounds-check array accesses or buffer operations during document processing. When maliciously crafted Office documents are opened, the application attempts to read memory locations beyond allocated buffers, potentially exposing confidential data such as passwords, encryption keys, or other sensitive information stored in adjacent memory regions. This type of vulnerability falls under the common weakness enumeration CWE-125 which specifically addresses out-of-bounds read conditions that can lead to information disclosure and potential privilege escalation scenarios. The operational impact extends beyond simple information leakage as attackers can leverage this flaw to gather intelligence about system configurations, user credentials, or application state details that could facilitate further exploitation attempts. According to the attack tactics framework, this vulnerability aligns with techniques categorized under credential access and defense evasion where adversaries attempt to harvest sensitive data while remaining undetected. The flaw typically manifests when Office applications process specially crafted documents containing malformed data structures that trigger the out-of-bounds memory access pattern. Attackers can exploit this by delivering malicious Office files through phishing campaigns, social engineering, or compromised websites targeting unsuspecting users who open these documents with vulnerable Office versions. Organizations face significant risk as this vulnerability can be exploited remotely when users open malicious files without requiring any special privileges or authentication mechanisms. The attack surface includes all Microsoft Office applications that process document formats such as word processing documents, spreadsheets, and presentation files. Mitigation strategies should include immediate deployment of Microsoft security updates, implementation of strict file validation policies, network segmentation to limit lateral movement, and user education programs to recognize potentially malicious Office documents. Additionally, enabling application control mechanisms and restricting Office applications from accessing sensitive system resources can help reduce the potential impact of successful exploitation attempts. The vulnerability demonstrates the critical importance of proper memory management practices in enterprise software and highlights how seemingly minor input validation flaws can result in significant information disclosure risks across multiple attack vectors.