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

> CVE-2019-9875: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-9875
Last updated: 2025-10-21T23:45:35Z

- Published: 2019-05-31 20:34 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: mitre
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 25.4%, 98th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2025-03-26, federal due date 2025-04-16, ransomware use: Unknown

## Description

Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.

## 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.

## Affected vendors and products

- Sitecore: CMS and Experience Platform (XP)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-9875)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-9875)
- [https://dev.sitecore.net/Downloads.aspx](https://dev.sitecore.net/Downloads.aspx)
- [https://www.synacktiv.com/blog.html](https://www.synacktiv.com/blog.html)
- [https://www.synacktiv.com/ressources/advisories/Sitecore\_CSRF\_deserialize\_RCE.pdf](https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-9875 · Markdown: https://rewindex.com/cve/CVE-2019-9875.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-9875 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:27.294Z