---
id: "CVE-2019-9874"
kind: "vulnerability"
aliases: ["CVE-2019-9874"]
title: "Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Sitecore CMS and Experience Platform (XP)", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "sitecore cms", "fixed": [], "affected": ">= 7.0, <= 7.2", "ecosystem": "vendor"}, {"name": "sitecore experience platform", "fixed": [], "affected": ">= 7.5, <= 8.2", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["asp.net", "exploited", "sitecore", "vendor", "windows"]
not_affected_if: ["not-sitecore"]
published_at: "2019-05-31T21:29:06+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-9874", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-9874", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to…

Sitecore CMS and Experience Platform (XP) deserialize untrusted .NET objects sent in the __CSRFTOKEN POST parameter of the Sitecore.Security.AntiCSRF module. An unauthenticated attacker can send a crafted serialized object and run arbitrary code on the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Sitecore CMS and Experience Platform (XP) affected ? fixed ?
- vendor:sitecore cms affected >= 7.0, <= 7.2 fixed ?
- vendor:sitecore experience platform affected >= 7.5, <= 8.2 fixed ?

## Fix

Apply the mitigations from Sitecore's vendor instructions, as CISA directs; the sources do not name a fixed version. If no mitigation is available, discontinue use of the product.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-9874
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2019-9874

## From the sources

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.

CISA 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_