CVE-2025-27218 Scanner

Sitecore Experience Manager (XM) and Experience Platform (XP) are widely used by businesses and developers to manage and deliver personalized digital experiences across various channels. These platforms allow for content management, marketing automation, and analytics, and are primarily used by marketing teams, web developers, and content creators. Users rely on Sitecore for its robust integration capabilities, allowing seamless connections with other systems such as CRM and ERP software. Sitecore plays a critical role in building and managing enterprise-level websites and applications. Due to its extensive functionality and scalability, it serves industries such as retail, healthcare, and financial services, providing tools for creating compelling customer experiences. Organizations choose Sitecore for its ability to handle complex content management tasks and deliver personalized experiences, contributing significantly to user engagement and conversion rates.

The vulnerability in question allows for remote code execution (RCE) through insecure deserialization in affected versions of Sitecore Experience Manager (XM) and Experience Platform (XP). Insecure deserialization is a significant security flaw that can lead to severe consequences, including arbitrary code execution. The vulnerability arises when untrusted data is deserialized, potentially allowing attackers to execute malicious code on the server. This can compromise the integrity and confidentiality of the system, posing a risk to sensitive data and operations. The flaw particularly affects versions prior to KB1002844, indicating that the deserialization mechanism lacks proper validation or sanitization of input data. Successfully exploiting this vulnerability could allow an attacker to gain unauthorized access and control of the affected application.

Technical details reveal that vulnerable endpoints in Sitecore Experience Manager (XM) and Experience Platform (XP) versions before KB1002844 process serialized objects without adequate verification. Attackers exploit this by sending crafted serialized objects that trigger the deserialization process to execute unexpected behavior. The vulnerable parameter resides within the deserialization logic, where it grants access to underlying systems if manipulated data is processed. The attack vector is typically facilitated through network protocols such as HTTP, where tampering with serialized object data in requests leads to the malicious outcome. This vulnerability underlines the importance of enforcing strict validation checks on any serialized data handled by the application. Identifying the precise endpoints and parameters affected is key to understanding the potential attack surface and implementing necessary security measures.

Exploiting this insecure deserialization vulnerability could result in attackers executing arbitrary code, potentially leading to full control over the affected server. This can have severe implications, such as unauthorized access to sensitive information, disruption of services, and planting of persistent threats within the network. Moreover, such exploitation may allow attackers to manipulate application behaviors, altering data, causing data leaks, or executing further attacks internally within the organization’s network. It could also undermine user trust and damage organizational reputation if sensitive data is compromised. Addressing this vulnerability is crucial to prevent significant financial and operational repercussions for the affected organizations.

REFERENCES

• https://slcyber.io/blog/sitecore-unsafe-deserialization-again-cve-2025-27218/
• https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003535