Description
It was determined that your web application is performing Java object deserialization of user-supplied data. Arbitrary object deserialization is inherently unsafe, and should never be performed on untrusted data. Consult Web references section for more information about this issue.
Remediation
Java object deserialization should not be performed on user-supplied data.
References
AppSecCali 2015 - Marshalling Pickles
What Do WebLogic, WebSphere, JBoss, Jenkins, OpenNMS, and Your Application Have in Common?
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Drupal Improper Input Validation Vulnerability (CVE-2018-7600)
Django Improper Input Validation Vulnerability (CVE-2011-4136)