CVE-2025-53690
Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability
Sitecore Multiple Products
Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 4 September 2025. US federal agencies were required to remediate it by 25 September 2025.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 60.6%, which is higher than 99.1% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Frequently asked questions
Is CVE-2025-53690 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-53690.
What does CVE-2025-53690 affect?
CVE-2025-53690 affects Sitecore Multiple Products. Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.
How severe is CVE-2025-53690?
CVE-2025-53690 is rated CRITICAL with a CVSS base score of 9. EPSS puts the probability of exploitation in the next 30 days at 60.6%, higher than 99.1% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 25 September 2025.
How should organisations respond to CVE-2025-53690?
Apply the vendor patch for Sitecore Multiple Products as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.