Known exploited vulnerability
CVE-2025-53690
The short answer
CVE-2025-53690 affects Sitecore Experience Manager (XM) and is rated critical (CVSS 9.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-09-04: attackers are using it, so patch it first.
What it is
Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Code Injection.This issue affects Experience Manager (XM): through 9.0; Experience Platform (XP): through 9.0.
Weakness: CWE-502.
Severity
9.0 critical
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Sep 4, 2025
Federal due date Sep 25, 2025
EPSS, next 30 days
61%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
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 products
Experience Manager (XM), Experience Platform (XP). NVD's record lists the exact affected versions.
References
- cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability ExploitThird Party Advisory
- support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1003865 Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53690 US Government Resource
Questions
Is CVE-2025-53690 being exploited?
Yes. CISA added CVE-2025-53690 to its Known Exploited Vulnerabilities catalog on 2025-09-04, with a federal remediation due date of 2025-09-25.
How do I fix CVE-2025-53690?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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