This vulnerability in Small Package Quotes – USPS Edition arises from unsafe deserialization of untrusted data, enabling an attacker with high privileges to inject malicious objects. The affected versions include all releases up to 1.3.9. The CVSS 3.1 base score is 7.2, reflecting network attack vector, low attack complexity, required high privileges, no user interaction, and high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently provided.

Successful exploitation could allow an attacker with high privileges to execute arbitrary code or manipulate application behavior, resulting in full compromise of data confidentiality, integrity, and availability within the affected application. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the affected application to trusted users with high privileges and monitor for unusual activity related to deserialization processes.