Sitecore Products ViewState Deserialization Vulnerability
Affects Sitecore XM and XP up to 9.0 when deployed with the sample ASP.NET machine key from public deployment guides. The checked facts list no fixed version.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Sitecore Experience Manager (XM) and Sitecore Experience Platform (XP) are affected by this flaw. An attacker could exploit the unsafe handling of untrusted data to inject and run malicious code on the affected system.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Sitecore Experience Manager (XM)
through 9.0
- Sitecore Experience Platform (XP)
through 9.0
References 2
support.sitecore.com
Questions about CVE-2025-53690
What does this mean?
A ViewState deserialization flaw in Sitecore can allow remote code execution on the Sitecore server.Source: cloud.google.com
Am I affected, and how do I check?
Sitecore Experience Manager (XM) and Experience Platform (XP) versions 0 through 9.0 are listed, along with Active Directory 1.4 and earlier. The listed condition is a deployment using the sample ASP.NET machine key exposed in publicly available deployment guides.Source: cloud.google.com
What should I do about it?
The checked facts list no fixed version, so no upgrade target can be given from them.Source: cloud.google.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-09-04, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts name no workaround. The listed condition is the sample ASP.NET machine key from publicly available deployment guides, so that key is the only setting the facts tie to the exposure.Source: cloud.google.com