Deserialization of Untrusted Data in Experience Manager and Sitecore Experience Platform - CVE-2025-27218
Published: October 8, 2025 / Updated: November 25, 2025
Vulnerability identifier: #VU116778
CSH Severity: Critical
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
CVE-ID: CVE-2025-27218
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Sitecore
Affected software:
Experience Manager
Sitecore Experience Platform
Experience Manager
Sitecore Experience Platform
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2025-27218
Install updates from vendor's website.