CVE-2025-27218 Scanner

Sitecore Experience Manager (XM) and Experience Platform (XP) are widely used digital experience platforms that enable businesses to manage and personalize content across multiple channels. These platforms provide customer experience management solutions, allowing organizations to create and deliver personalized digital experiences. Sitecore XM/XP is commonly used by enterprises, including marketing agencies, e-commerce platforms, and large-scale websites. The software includes robust content management and analytics features that help businesses track user interactions. Organizations rely on Sitecore for seamless integration with their marketing strategies and customer relationship management (CRM) systems. Due to its widespread adoption, security vulnerabilities in Sitecore can have significant implications for businesses handling sensitive customer data.

This vulnerability affects Sitecore Experience Manager (XM) and Experience Platform (XP) 10.4 before KB1002844 and allows remote code execution through insecure deserialization. The issue arises when untrusted user input is processed without proper validation, leading to potential arbitrary code execution. Attackers can exploit this flaw by injecting malicious serialized objects, causing the system to execute unauthorized commands. The vulnerability is classified under CWE-94 (Improper Control of Generation of Code), highlighting the risks of executing unvalidated user input. Exploiting this vulnerability could allow attackers to compromise Sitecore installations and execute arbitrary code remotely. Organizations using vulnerable versions are advised to apply security patches immediately.

The vulnerability exists due to the improper handling of serialized data in Sitecore Experience Manager (XM)/Experience Platform (XP). Attackers can send specially crafted serialized payloads to trigger arbitrary code execution on the target system. The exploitation occurs via the "ThumbnailsAccessToken" header, which processes serialized objects without proper validation. By modifying this header, an attacker can craft a malicious request that forces the system to deserialize and execute unauthorized code. This flaw enables remote execution of arbitrary commands, potentially leading to full system compromise. The issue can be exploited over the network, making it a significant risk for publicly exposed Sitecore instances.

If exploited, this vulnerability could lead to remote code execution, allowing attackers to gain full control over the affected system. Malicious actors may install backdoors, exfiltrate sensitive data, or manipulate website content. Successful exploitation can lead to privilege escalation, granting attackers administrative access to the Sitecore environment. Unauthorized code execution may also be used to deploy ransomware, disrupt business operations, or pivot to other systems in the network. The vulnerability poses a severe risk to organizations relying on Sitecore for digital content management and customer interactions. Organizations should patch affected versions immediately to mitigate the risk of exploitation.

REFERENCES

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