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CVE-2019-9874

Sitecore CMS and Experience Platform (XP) Deserialization

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 83.7%
  1. Published31 May 2019
  2. Added to CISA KEV26 Mar 2025
  3. Remediation due16 Apr 2025
Actively exploited (CISA KEV)

Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

Added to KEV: 26 Mar 2025Federal remediation due: 16 Apr 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Sitecore CMS≥ 7.0 ≤ 7.2
Sitecore Experience Platform≥ 7.5 ≤ 8.2

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2019-9874 being actively exploited?

Yes. CVE-2019-9874 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 26 Mar 2025.

How severe is CVE-2019-9874?

CVE-2019-9874 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 83.7% probability of exploitation.

Which products are affected by CVE-2019-9874?

Affected products include Sitecore CMS, Sitecore Experience Platform.

How do I fix CVE-2019-9874?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-9874 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.