CVE-2025-26630
Published: 11 March 2025
Summary
CVE-2025-26630 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft Office Long Term Servicing Channel. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 31.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-26630 is a use-after-free vulnerability (CWE-416) affecting Microsoft Office Access. Published on 2025-03-11, it carries a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). The flaw enables an unauthorized attacker to execute code locally on a system running the affected component.
Exploitation requires local access to the target system, low attack complexity, and no privileges from the attacker, though user interaction is necessary, such as opening a malicious file. A successful attack allows arbitrary code execution, resulting in high impacts to confidentiality, integrity, and availability.
Microsoft's Security Response Center provides guidance on updates and mitigation in its advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26630.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-6313
Vulnerability details
Use after free in Microsoft Office Access allows an unauthorized attacker to execute code locally.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The use-after-free vulnerability in Microsoft Office Access enables arbitrary code execution upon opening a malicious file, directly mapping to T1203 (Exploitation for Client Execution) and T1204.002 (Malicious File under User Execution).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Flaw remediation requires timely patching of the use-after-free vulnerability in Microsoft Office Access as provided in the vendor advisory.
Memory protection mechanisms such as ASLR, DEP, and control flow guard directly mitigate exploitation of use-after-free vulnerabilities by preventing unauthorized code execution.
Malicious code protection scans Office files for threats and can block or detect malicious Access documents requiring user interaction to exploit.