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Exploited vulnerability · CISA KEV

Is CVE-2019-9874 exploited? Yes: in CISA KEV since 26 Mar 2025

Gociux · Sitecore CMS and Experience Platform (XP) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-9874, Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 26 Mar 2025, 2126 days after it was published. It affects Sitecore CMS and Experience Platform (XP). If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 26 Mar 2025
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due16 Apr 2025BOD 22-01 deadline

What it is

Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

VendorSitecore (4 exploited CVEs in KEV)
ProductCMS and Experience Platform (XP)
VulnerabilitySitecore CMS and Experience Platform (XP) Deserialization Vulnerability
WeaknessCWE-502
Published31 May 2019
Added to KEV26 Mar 2025
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for CMS and Experience Platform (XP) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Sitecore CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 31 May 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Sitecore.

Other exploited CVEs in CMS and Experience Platform (XP)

References

Questions

Is CVE-2019-9874 being exploited?

Yes. CISA added CVE-2019-9874 to the Known Exploited Vulnerabilities catalog on 26 Mar 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-9874 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2019-9874?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Sitecore's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected CMS and Experience Platform (XP) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2025 · Sitecore scorecard · act-now radar.

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