Rule Document 1:66850

Rule Category

POLICY-OTHER --

Alert Message

POLICY-OTHER PTC Windchill and FlexPLM chunked cache upload attempt

Rule Explanation

This rule looks for HTTP requests directed to the Windchill cache upload servlet "wt.fv.uploadtocache.DoUploadToCache_Server" that include the query parameter "UploadInChunks=true". This upload path is vulnerable to an insecure deserialization vulnerability that may lead to remote code execution.

What To Look For

This rule fires on chunked cache upload attempts to PTC Windchill and FlexPLM web applications.

Known Usage

No public information

False Positives

Known false positives, with the described conditions

This rule may fire on legitimate uploads to the cache location on PTC Windchill web applications. Network administrators should investigate all events to determine maliciousness.

Contributors

Cisco Talos Intelligence Group

Rule Groups

MITRE::ATT&CK Framework::Enterprise::Initial Access::Exploit Public-Facing Application

Adversaries may attempt to take advantage of a weakness in an Internet-facing computer or program using software, data, or commands in order to cause unintended or unanticipated behavior. The weakness in the system can be a bug, a glitch, or a design vulnerability. These applications are often websites, but can include databases (like SQL), standard services (like SMB or SSH), network device administration and management protocols (like SNMP and Smart Install), and any other applications with Internet accessible open sockets, such as web servers and related services.

Rule Categories::Server::Other

Rule Categories::Server::Web Applications

Vulnerability::Severity::Critical

Vulnerability::Severity::High

CVE

CVE-2026-12569

Additional Links

ptc.com/en/about/trust-center/advisory-center/active-advisories/windchill-flexplm-rce-vulnerability

Rule Vulnerability

Insecure Deserialization

Insecure Deserialization relates to web application security. Applications turn an object into data through serialization; the reverse of that process, deserialization, can be vulnerable to attacks when the application trusts the data that is being deserialized. Serialized data is machine readable and not encrypted; serialized user-supplied data should not be trusted. Deserialization attacks can lead to remote code execution.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2026-12569

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