CVE-2026-69529 in 365 Apps for Enterprise
Summary
by MITRE • 09/09/2026
Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described constitutes a critical security flaw within the Microsoft Office Access application, specifically manifesting as a heap-based buffer overflow condition. This type of memory corruption error occurs when a program writes more data to a dynamically allocated block of memory on the heap than it was intended to hold. In the context of Microsoft Office Access, this defect is typically triggered by processing specially crafted files or inputs that exploit improper bounds checking during data parsing operations. The attacker can manipulate these input vectors to overwrite adjacent memory structures, thereby gaining control over critical execution flow pointers such as return addresses or function pointers stored on the heap. This mechanism allows for arbitrary code execution with the privileges of the currently logged-in user, representing a severe compromise of system integrity and confidentiality.
From an operational perspective, this vulnerability is particularly dangerous because it can be exploited remotely over a network without requiring physical access to the target machine. An attacker could distribute maliciously crafted Access database files or exploit related protocols that interact with the application to trigger the overflow condition upon opening or processing these files by a victim user. The successful exploitation leads to full system compromise, enabling the execution of any commands on the affected host. This can result in data theft, installation of malware, creation of backdoors for persistent access, and lateral movement within an enterprise network if the compromised account possesses elevated privileges. Given that Microsoft Office Access is widely used in business environments for database management, this vulnerability poses a significant risk to organizational security postures by targeting a common entry point through social engineering or automated scanning campaigns.
The technical classification of this flaw aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-120 Buffer Copy without Checking Size of Input and CWE-787 Out-of-bounds Write, which describe the fundamental memory safety violations involved in heap overflows. Furthermore, the exploitation technique maps to MITRE ATT&CK framework tactics including Initial Access via Spearphishing Attachment or Drive-by Compromise, followed by Execution through Command Line Interface or Scripting Interpreter depending on how the payload is delivered and executed post-exploitation. Understanding these mappings helps security teams prioritize patching efforts and implement detection rules based on known exploitation patterns associated with heap corruption in Office applications.
Mitigation strategies must focus primarily on applying vendor-supplied patches to update Microsoft Office Access to a version that includes fixes for this memory safety issue. Organizations should enforce strict software update policies to ensure all endpoints are protected against known vulnerabilities. Additionally, implementing application control solutions can prevent the execution of unauthorized scripts or binaries launched by exploited applications. Network segmentation and monitoring tools such as Intrusion Detection Systems (IDS) or Endpoint Detection and Response (EDR) platforms should be configured to detect anomalous behavior indicative of exploitation attempts, including unusual memory access patterns or unexpected process spawns following file interactions. User awareness training is also critical to reduce the likelihood of users opening unsolicited Access files that may contain malicious payloads designed to trigger this specific heap overflow condition.