CVE-2025-23909 describes a stored cross-site scripting vulnerability in Common Ninja's Compare Ninja product (versions up to 2.1.0). The vulnerability is due to improper input neutralization during web page generation, which can allow an attacker to inject malicious scripts that persist and execute in the context of users viewing the affected pages. The CVSS 3.1 base score is 6.5, reflecting network attack vector, low attack complexity, requiring low privileges and user interaction, with impacts on confidentiality, integrity, and availability at a low level. No patch or vendor advisory is currently provided, and no known exploitation has been reported.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to information disclosure, session hijacking, or other impacts on confidentiality, integrity, and availability. The impact is rated as medium severity with low-level impacts on confidentiality, integrity, and availability. No known exploits in the wild have been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or fix information is available, users should monitor for vendor updates. Until a fix is released, consider applying input validation or output encoding controls if possible to mitigate stored XSS risks in the affected product.