CVE-2025-47166
Published: 10 June 2025
Summary
CVE-2025-47166 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Microsoft Sharepoint Server. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 6.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Microsoft Office SharePoint contains a deserialization of untrusted data flaw tracked as CVE-2025-47166 and assigned CWE-502. The vulnerability received a CVSS 3.1 score of 8.8 and permits remote code execution when an attacker supplies crafted serialized content to the affected component.
An authorized attacker with low privileges can trigger the issue over a network with no user interaction required, achieving full read, write, and execute control over the target SharePoint server.
The Microsoft Security Response Center advisory published at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47166 supplies patch information and recommended mitigation actions. The associated EPSS score has risen from a low baseline to a current value of 0.1035 with a recorded peak of 0.1409.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-17733
Vulnerability details
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.