CVE-2025-59228
Published: 14 October 2025
Summary
CVE-2025-59228 is a high-severity Improper Input Validation (CWE-20) vulnerability in Microsoft Sharepoint Server. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 48.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-59228 is an improper input validation vulnerability affecting Microsoft Office SharePoint. Published on 2025-10-14T17:16:03.747, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and maps to CWE-20 (Improper Input Validation), with additional NVD-CWE-noinfo classification.
An authorized attacker with low privileges (PR:L) can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L) and no user interaction required (UI:N). Successful exploitation enables arbitrary code execution in the context of the SharePoint service, resulting in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H) without scope change (S:U).
Microsoft's advisory provides guidance on this vulnerability at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59228.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-34386
Vulnerability details
Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables remote code execution via improper input validation in Microsoft Office SharePoint, a public-facing web application, directly mapping to exploitation of public-facing applications.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly implements information input validation mechanisms to prevent exploitation of the improper input validation vulnerability in Microsoft Office SharePoint.
Requires timely flaw remediation, including patching CVE-2025-59228 as directed by Microsoft's advisory, to eliminate the specific vulnerability.
Provides memory protection safeguards that mitigate arbitrary code execution even if invalid input bypasses validation in the SharePoint service.