SB2025090436 - Remote code execution in Sitecore products
Published: September 4, 2025 Updated: September 19, 2025
Security Bulletin ID
SB2025090436
Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Deserialization of Untrusted Data (CVE-ID: CVE-2025-53690)
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 in ViewState. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.
The vulnerability affects users who deployed any version of multiple Sitecore products using the sample key exposed in publicly available deployment guides (specifically Sitecore XP 9.0 and Active Directory 1.4 and earlier versions).Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.