This vulnerability (CVE-2025-26747) in 99colorthemes RainbowNews versions up to 1.0.7 is a stored cross-site scripting (CWE-79) issue caused by improper input neutralization during web page generation. An attacker can inject malicious scripts that are stored and later executed in the context of other users' browsers, potentially leading to information disclosure, session hijacking, or other impacts. The CVSS 3.1 vector indicates network attack vector, low attack complexity, requiring low privileges and user interaction, with scope changed and low impact on confidentiality, integrity, and availability. No official patch or vendor advisory with remediation details is currently available.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of users' browsers interacting with the vulnerable RainbowNews application. This can lead to limited confidentiality, integrity, and availability impacts as indicated by the CVSS vector. No known exploits are reported in the wild, so the immediate risk appears moderate.

No official patch or remediation guidance is currently available from the vendor. Users should monitor the vendor's advisories for updates. Until a fix is released, consider applying temporary mitigations such as input validation or output encoding at the application level to reduce the risk of stored XSS. Avoid exposing the vulnerable application to untrusted users where possible.