CVE-2019-9874

Name: CVE-2019-9874
Creator: NVD / NIST
Published: 2019-05-31T21:29:06.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 83.86%

Last modified Jun 17, 2026

CVE-2019-9874 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 83.86% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

83.86%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Apr 16, 2025.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sitecore	Cms	>= 7.0, <= 7.2
Sitecore	Experience Platform	>= 7.5, <= 8.2

References

https://dev.sitecore.net/Downloads.aspxProduct, Vendor Advisory
https://www.synacktiv.com/blog.htmlThird Party Advisory
https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdfExploit, Patch, Third Party Advisory
https://dev.sitecore.net/Downloads.aspxProduct, Vendor Advisory
https://www.synacktiv.com/blog.htmlThird Party Advisory
https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdfExploit, Patch, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9874US Government Resource

Timeline

Published: May 31, 2019
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2019-9874?

How severe is CVE-2019-9874?

CVE-2019-9874 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 83.86% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2019-9874?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9874?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST