Exploited vulnerability · CISA KEV

Is CVE-2025-53690 exploited? Yes: in CISA KEV since 4 Sep 2025

Gociux · Sitecore Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-53690, Sitecore Multiple Products Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 4 Sep 2025, 1 days after it was published. It affects Sitecore Multiple Products. 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.

What it is

Sitecore Experience Manager (XM), Experience Platform (XP), Experience Commerce (XC), and Managed Cloud contain a deserialization of untrusted data vulnerability involving the use of default machine keys. This flaw allows attackers to exploit exposed ASP.NET machine keys to achieve remote code execution.

What to do

1. Check whether you run it. Look for Multiple Products 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 3 Sep 2025.
4. Get told next time. Email alerts when CISA adds a CVE for Sitecore.

References

• support.sitecore.com/kb
• nvd.nist.gov/vuln/detail/CVE-2025-53690

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 September 2025 · Sitecore scorecard · act-now radar.