Description

Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:52.440Z",
  "pubdate": "2026-08-11T17:18:52.440Z",
  "executiveSummary": "A stack-based buffer overflow vulnerability has been identified within Microsoft Office Access, posing significant risk to system integrity and user security.\nThis vulnerability allows an unauthorized local attacker to execute arbitrary code within the context of the currently logged-on user.\nThe flaw stems from improper validation of input data length when processing specific structures within Microsoft Office Access, resulting in memory corruption on the stack.\nSuccessful exploitation of this security defect can lead to localized system compromise, unauthorized data access, or application crashes.\nAlthough the attack requires local execution capabilities by an unauthorized threat actor, the severity of potential code execution necessitates prompt remediation through official vendor patches and strict adherence to principle of least privilege access controls.",
  "technicalDetails": "The vulnerability is classified as a stack-based buffer overflow, occurring when Microsoft Office Access processes malformed input without adequately verifying the size bounds of the data being copied into allocated stack memory buffers.\nThe vulnerable component resides within the parsing logic of Microsoft Office Access, specifically handling untrusted file formats or data structures that exceed expected memory allocations.\nWhen an unauthorized local attacker supplies a specially crafted file or input stream designed to trigger the parsing routines, the excessive data overflows the boundaries of the stack-based buffer.\nThis overflow overwrites adjacent stack memory structures, including critical execution control data such as saved frame pointers and return addresses.\nDuring the step-by-step exploitation flow, the instruction pointer (EIP/RIP) is redirected to malicious shellcode injected into the stack by the attacker, contingent upon bypassing modern exploit mitigations if present.\nAuthentication requirements are minimal, as the attack surface is exposed locally to any unauthorized user capable of launching the application with the malicious payload.\nPrivilege requirements are limited to standard local user privileges, meaning the resulting arbitrary code execution inherits the security context of the targeted user running Microsoft Office Access.\nNetwork exposure is not directly applicable for remote exploitation vectors based on the provided parameters, classifying this strictly as a local attack vector.\nPost-exploitation impact includes unauthorized execution of arbitrary commands, escalation of privileges if auxiliary local kernel vulnerabilities exist, deployment of secondary payloads, and persistent compromise of the local user environment."
}