This vulnerability in Progress MOVEit Transfer is classified as CWE-79, indicating improper neutralization of input during web page generation, commonly known as cross-site scripting (XSS). The flaw allows an attacker with low privileges and requiring user interaction to potentially execute arbitrary code in the context of the affected web application. The vulnerability affects specific versions: all versions before 2025.1.5, the exact version 2026.0.0, and versions from 2026.0.0 up to but not including 2026.0.3. The CVSS 3.1 base score is 7.1, reflecting high impact on confidentiality, integrity, and availability if exploited. The vendor has not yet provided an official fix or remediation level, and no public exploits have been reported.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the MOVEit Transfer web interface, potentially leading to theft of sensitive information, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability. The attack requires user interaction and low privileges, with a high attack complexity.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should apply standard XSS mitigations such as input validation and output encoding where possible. Monitor vendor communications for updates on patches or official mitigations.