CVE-2025-53690## CVE-2025-53690: Critical Remote Code Execution Vulnerability in Sitecore XM/XP
CVE-2025-53690 is a critical vulnerability in Sitecore's Experience Manager (XM) and Experience Platform (XP), versions up to 9.0. It stems from insecure deserialization of untrusted data, specifically exploiting exposed ASP.NET machine keys. This flaw allows attackers to execute arbitrary code remotely, potentially compromising the affected systems.
### Vulnerability Details
* **Type**: Deserialization of Untrusted Data (CWE-502)
* **Severity**: Critical
* **CVSS Score**: 9.0
* **Impacted Versions**: Sitecore Experience Manager (XM) and Experience Platform (XP) through version 9.0
* **Exploitation Method**: Attackers exploit exposed machine keys from public deployment guides to perform remote code execution via ViewState deserialization attacks.
### Attack Vector
The vulnerability arises when Sitecore applications deserialize ViewState data without proper validation, allowing attackers to inject malicious code. This issue is particularly critical for internet-facing deployments using default or exposed machine keys.
### Real-World Exploitation
Mandiant Threat Defense identified active exploitation of this vulnerability, where attackers leveraged the exposed machine key to gain unauthorized access. The attack chain included:
1. **Initial Compromise**: Exploitation of the ViewState deserialization flaw to execute arbitrary code.
2. **Malware Deployment**: Installation of reconnaissance tools like WEEPSTEEL for internal network mapping.
3. **Credential Harvesting**: Collection of sensitive files and creation of local administrator accounts to dump system credentials.
4. **Lateral Movement**: Use of compromised credentials for further system access.
### Mitigation
Sitecore has released patches addressing CVE-2025-53690. Affected users are urged to apply these updates promptly. Additionally, the Cybersecurity and Infrastructure Security Agency (CISA) has added this vulnerability to its Known Exploited Vulnerabilities Catalog, recommending remediation by September 25, 2025.
For detailed guidance, refer to Sitecore's Security Bulletin SC2025-005.
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