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

CVE-2019-9875 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2025-03-26

Sitecore CMS and Experience Platform (XP) through version 9.1 contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module. An authenticated attacker can execute arbitrary code by sending a malicious serialized .NET object via the __CSRFTOKEN HTTP POST parameter.

Technologies: Sitecore CMS, Sitecore Experience Platform (XP). Vendors: Sitecore.

Quick answers

Is CVE-2019-9875 exploited in the wild?
Yes. CVE-2019-9875 is known to be exploited in the wild, first recorded on 26 March 2025. Treat it as urgent.
How severe is CVE-2019-9875?
Critical severity, with a CVSS score of 8.8, published 26 March 2025.
Which products and versions are affected?
Sitecore CMS up to and including 9.1; Sitecore Experience Platform (XP) up to and including 9.1.
Is there a fix for CVE-2019-9875?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2019-9875 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2019-9875?
Check whether you run Sitecore CMS or Sitecore Experience Platform (XP). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Sitecore CMS up to and including 9.1
  • Sitecore Experience Platform (XP) up to and including 9.1

Timeline

  • 2019-05-31: disclosed: NVD Published Date
  • 2025-03-26: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2025-03-26: exploited: Reported as exploited in the wild in CISA KEV catalog

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