CVE-2025-27744 in Office
Summary
by MITRE • 04/08/2025
Improper access control in Microsoft Office allows an authorized attacker to elevate privileges locally.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/09/2025
The vulnerability identified as CVE-2025-27744 represents a critical access control flaw within Microsoft Office applications that enables authorized attackers to escalate their privileges locally on affected systems. This issue stems from insufficient authorization checks and validation mechanisms within the Office application framework, creating opportunities for malicious actors who already possess legitimate user credentials to gain elevated system permissions. The flaw exists in the way Microsoft Office handles privilege escalation scenarios during normal operational tasks, particularly when executing certain administrative functions or accessing protected system resources.
This vulnerability operates at the intersection of several cybersecurity domains and aligns with CWE-284 which describes improper access control vulnerabilities. The technical implementation flaw manifests when Office applications process specific API calls or system interactions that should require elevated privileges but instead permit unauthorized escalation through legitimate user sessions. Attackers can exploit this by leveraging their existing authorized access to perform actions that should be restricted to administrators or system-level processes. The attack vector typically involves local execution where the attacker already has valid user credentials and can manipulate Office processes to execute privileged operations.
The operational impact of CVE-2025-27744 extends beyond simple privilege escalation to potentially enable full system compromise. Once elevated privileges are obtained, attackers can modify system configurations, install malicious software, access sensitive data, and establish persistent access to the compromised system. This vulnerability particularly affects enterprise environments where Office applications are widely deployed and users often maintain administrative privileges for legitimate business operations. The risk is amplified when users operate with elevated privileges or when Office applications are configured to run with higher permissions than necessary, creating a more favorable environment for exploitation.
Mitigation strategies for this vulnerability should focus on implementing comprehensive privilege management practices and maintaining up-to-date security patches from Microsoft. Organizations must enforce the principle of least privilege by ensuring users operate with minimal necessary permissions rather than administrative rights. Security configurations should include disabling unnecessary Office features that might expose privilege escalation paths, implementing application control measures such as Windows Defender Application Control, and monitoring for anomalous privilege elevation activities. Network segmentation and access controls should be reinforced to limit the potential impact of successful exploitation, while regular security assessments should verify that Office configurations comply with security best practices. Additionally, administrators should consider implementing advanced threat detection solutions that can identify suspicious privilege escalation patterns and correlate them with Office application usage. The vulnerability underscores the importance of maintaining current security postures and following industry standards such as those outlined in the MITRE ATT&CK framework for privilege escalation techniques, which specifically addresses methods that leverage application flaws like this one to gain elevated system access.