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CVE-2019-9875: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability

criticalknown exploitedCVE-2019-9875
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Sitecoreproduct: CMS and Experience Platform (XP)Unsafe deserializationRemote code execution
What
An authenticated attacker can execute arbitrary code via a deserialization vulnerability in the AntiCSRF module.
Who is affected
Authenticated users of Sitecore CMS and Experience Platform (XP) are affected.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and critical.
Action
Apply the latest security patches provided by Sitecore.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-03-26
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-9875

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2019-9875coverage & exploitation statusNVD · CVE.org

Recent advisories for Sitecore CMS and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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