CVE-2025-39487 is a reflected cross-site scripting vulnerability in ValvePress Rankie (<= 1.8.2) caused by improper neutralization of input during web page generation. This allows attackers to inject malicious scripts that execute in users' browsers when they visit crafted URLs or interact with vulnerable web pages. The CVSS 3.1 base score is 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability at low levels.

Successful exploitation of this vulnerability can allow an attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to theft of sensitive information, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability at a limited level. The scope change indicates that the vulnerability affects resources beyond the initially vulnerable component.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution when interacting with untrusted input or links related to ValvePress Rankie. Monitor vendor communications for updates on patches or official mitigations.