CVE-2019-9875
Actively exploited. CVE-2019-9875 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-03-26) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching 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
- 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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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 96% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2019-9875: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerabilitycisa-kev · 2025-03-26
External references
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[](https://www.csirts.com/cve/CVE-2019-9875)