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CVE-2019-9875

Sitecore CMS and Experience Platform (XP) Deserialization

8.8 HIGHActively exploited (CISA KEV)Public exploitEPSS 13.8%
  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 authenticated 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 anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.

CVSS 3.1 breakdown

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

Affected products

Sitecore CMS≤ 9.1

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-2019-9875 being actively exploited?

Yes. CVE-2019-9875 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 26 Mar 2025.

How severe is CVE-2019-9875?

CVE-2019-9875 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 13.8% probability of exploitation.

Which products are affected by CVE-2019-9875?

Affected products include Sitecore CMS.

How do I fix CVE-2019-9875?

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-2019-9875 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.