{"id":64167,"date":"2025-08-19T11:55:58","date_gmt":"2025-08-19T11:55:58","guid":{"rendered":""},"modified":"2025-09-04T22:37:00","modified_gmt":"2025-09-05T04:37:00","slug":"cve-2025-49712-deserialization-of-untrusted-data-in-microsoft-office-sharepoint","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49712-deserialization-of-untrusted-data-in-microsoft-office-sharepoint\/","title":{"rendered":"CVE-2025-49712: Deserialization of Untrusted Data in Microsoft Office SharePoint<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

In the realm of cybersecurity, vulnerabilities refer to weaknesses that could potentially be exploited by malevolent actors to compromise a system. One such vulnerability, identified as CVE-2025-49712, has been recently detected in Microsoft Office SharePoint. This vulnerability is particularly dangerous because it allows an authorized<\/a> attacker to execute code over a network.
\nMicrosoft Office<\/a> SharePoint is a widely used platform for collaboration and document management, which signifies the severity of this vulnerability. The potential fallout from a successful exploit includes system compromise and data leakage<\/a>, which could be devastating for businesses that use SharePoint for storing and sharing sensitive information.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-49712
\nSeverity: High (8.8 on CVSS Severity Score)
\nAttack Vector: Network
\nPrivileges Required: Low
\nUser Interaction: Required
\nImpact: System compromise or data<\/a> leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Microsoft Office<\/a> SharePoint | All versions prior to the latest patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability stems from the deserialization<\/a> of untrusted data in Microsoft Office SharePoint. Deserialization is the process of converting a stream of bytes back into a copy of the original object. When an attacker can manipulate the serialized data and it’s deserialized<\/a> without validation, it can lead to malicious code execution.
\nIn this case, an attacker who is already authenticated on the SharePoint server can send a specially crafted payload that, when deserialized by the SharePoint server, leads to the execution of arbitrary code<\/a>. This could allow the attacker to take control of the server<\/a>, potentially gaining access to sensitive information or disrupting services.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

This is a conceptual example of how the vulnerability might be exploited. This example uses a malicious JSON payload in a POST request to a vulnerable<\/a> SharePoint endpoint.<\/p>\n

POST \/vulnerable\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"malicious_payload\": \"{ serialized_object_with_malicious_code }\"\n}<\/code><\/pre>\n
Upon receiving this request, the SharePoint server would then deserialize the payload, executing the malicious code<\/a> embedded within it.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
The most effective way to mitigate this vulnerability is to apply the patch provided by the vendor, Microsoft, as soon as it becomes available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used to detect and block attempts to exploit this vulnerability<\/a>. Regular monitoring and auditing of SharePoint servers for any unusual activity is also recommended.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In the realm of cybersecurity, vulnerabilities refer to weaknesses that could potentially be exploited by malevolent actors to compromise a system. One such vulnerability, identified as CVE-2025-49712, has been recently detected in Microsoft Office SharePoint. This vulnerability is particularly dangerous because it allows an authorized attacker to execute code over a network. Microsoft Office […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64167","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t