Vulnerabilities
CVE-2026-105591: Microsoft Office Access Remote Code Execution Vulnerability
A heap-based buffer overflow in Microsoft Office Access allows an unauthenticated attacker to execute arbitrary code over the network via a crafted database file. Microsoft has released a patch; defenders should update immediately and restrict network exposure of Access.
What Happened
A heap-based buffer overflow in Microsoft Office Access (CVE‑2026‑105591) permits an attacker to execute code remotely by delivering a malicious Access database file. The vulnerability is exploitable without user interaction, provided the target system can receive the file over the network.
Impact
Unauthenticated remote code execution can lead to full system compromise, data exfiltration, or lateral movement within the network. The flaw affects all supported versions of Office Access that have not applied the latest security update.
Mitigation
- Apply the official patch from Microsoft as soon as possible.
- Block inbound traffic to Office Access services on non‑trusted networks.
- Enable application whitelisting for Access and related components.
- Monitor for anomalous process creation or privilege escalation events.
- Verify that any legacy Access files are scanned or isolated before opening.
Defenders should treat this as a high‑severity RCE and prioritize remediation in the same cycle as other critical updates.
Related vulnerabilities
CVE-2026-102850: Microsoft Office Access Remote Code Execution via Heap Overflow
A heap‑based buffer overflow in Microsoft Office Access (CVE‑2026‑102850) allows an unauthenticated attacker to execute code over a network. The flaw can be triggered by a crafted Access file. Defenders should apply the latest Office updates immediately and consider disabling Access on untrusted networks.
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CVE-2026-105598: Microsoft Office Access Heap Overflow Enables Remote Code Execution
A heap-based buffer overflow in Microsoft Office Access (CVE‑2026‑105598) allows attackers to run arbitrary code over a network. The flaw is exploitable without user interaction and can be triggered by crafted Access files. Defenders should apply the latest Office updates and restrict network exposure of Access documents.
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