CVE-2026-80088 in Office
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds read within Microsoft Office Word represents a critical memory safety flaw that compromises the confidentiality of system data through remote exploitation vectors. This specific type of error occurs when the application attempts to access memory locations beyond the boundaries of allocated buffers, typically due to insufficient validation of input parameters or improper handling of malformed document structures. In the context of Microsoft Office applications, this often involves parsing complex file formats such as DOCX or RTF where embedded objects, macros, or specific formatting instructions are processed by internal rendering engines. When an attacker crafts a malicious Word document containing specially designed content that triggers this boundary violation, the application may read sensitive data from adjacent memory regions rather than crashing immediately or returning an error code. This behavior allows for the leakage of information stored in the process memory space, which can include credentials, encryption keys, session tokens, or other proprietary data residing within the same address space as the Office application.
From a technical perspective, this flaw aligns with Common Weakness Enumeration category CWE-125, Out-of-bounds Read, which describes situations where software reads data past the end of a buffer. The operational impact is primarily focused on information disclosure rather than direct code execution or privilege escalation in its initial state. However, the ability to read arbitrary memory locations significantly aids attackers in further exploitation efforts by providing context about the target environment, such as ASLR bypass techniques or finding pointers to other vulnerable functions within the application binary. This vulnerability can be triggered remotely if a user is tricked into opening an attached malicious document via email or downloading it from a compromised website, making it a high-risk threat for organizations relying on Microsoft Office for daily operations. The attack vector leverages social engineering combined with technical exploitation of parsing logic flaws in the Word processing engine.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. Organizations should immediately apply available patches from Microsoft that resolve this specific out-of-bounds read condition, ensuring all instances of Office Word are updated to versions where input validation for document structures has been strengthened. Additionally, implementing application control policies such as AppLocker or Windows Defender Application Control can restrict the execution of untrusted scripts and macros often used in conjunction with these exploits. Network segmentation should be employed to limit lateral movement if an endpoint is compromised, reducing the potential blast radius of information leakage. Users must be trained to recognize suspicious attachments and avoid opening documents from unknown sources. Furthermore, enabling Enhanced Security Configuration for Office applications can provide additional layers of protection by restricting access to external resources and disabling potentially dangerous features by default. Regular vulnerability scanning and monitoring for anomalous memory usage patterns in Word processes can also aid in early detection of exploitation attempts targeting this weakness.