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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2019-9874

Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

Sitecore CMS and Experience Platform (XP)

Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to 7.2 and Sitecore XP 7.5 to 8.2 allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

CVSS
9.8
CRITICAL
EPSS
83.7%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
31 May 2019
CWE-502

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 26 March 2025. US federal agencies were required to remediate it by 16 April 2025.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 83.7%, which is higher than 99.7% 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:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2019-9874 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2019-9874.

What does CVE-2019-9874 affect?

CVE-2019-9874 affects Sitecore CMS and Experience Platform (XP). Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to 7.2 and Sitecore XP 7.5 to 8.2 allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

How severe is CVE-2019-9874?

CVE-2019-9874 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 83.7%, higher than 99.7% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 16 April 2025.

How should organisations respond to CVE-2019-9874?

Apply the vendor patch for Sitecore CMS and Experience Platform (XP) 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.