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CVE-2019-9874

9.8, critical Known exploited

Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
84% higher than 99.6% of scored CVEs
Exploitation
Confirmed in the wild
Published
31 May 20197 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 26 Mar 2025. US federal agencies had to remediate by 16 Apr 2025, a deadline that has passed.

Required action. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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.

Details

Vendor
Sitecore
Product
CMS
Weakness
CWE-502 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

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

References 4

Exploit code 1

Advisories 2

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Sitecore CVEs

Every Sitecore CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-53690 Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability KEV EPSS 61% 9, critical
  • CVE-2021-42237 Sitecore XP Remote Command Execution Vulnerability KEV EPSS 98% 9.8, critical
  • CVE-2019-9875 Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability KEV EPSS 14% 8.8, high

Beyond this page

Is CVE-2019-9874 in your network?

This page tells you how dangerous CVE-2019-9874 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2019-9874 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2019-9874 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.