CVE-2019-9874Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via unchecked CSRF-token deserialization

Published May 31, 2019 · Updated Oct 21, 2025

Deserialization in Sitecore CMS 7.0 through 7.2 and XP 7.5 through 8.2 allows remote attackers to execute code via CSRF tokens. SitecoreAntiCsrfModule deserializes the __CSRFTOKEN POST parameter using ObjectStateFormatter without signature validation before comparing it with __CSRFCOOKIE. The vendor identifies a broader affected span from CMS 6.6.3 through XP 8.2.7; reachable /sitecore/shell pages require no authentication, and injected code runs with the service account's privileges.

CVSS severity9.8
Critical
EPSS probability83.74%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Sitecore CMS 7.0 through 7.2 and XP 7.5 through 8.2 allows remote attackers to execute code via CSRF tokens. SitecoreAntiCsrfModule deserializes the __CSRFTOKEN POST parameter using ObjectStateFormatter without signature validation before comparing it with __CSRFCOOKIE. The vendor identifies a broader affected span from CMS 6.6.3 through XP 8.2.7; reachable /sitecore/shell pages require no authentication, and injected code runs with the service account's privileges.

The record

CVE
CVE-2019-9874
Published
May 31, 2019
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2019CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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