The vulnerability CVE-2025-26739 in themefunction newseqo (up to version 2.1.1) is a stored cross-site scripting (CWE-79) issue caused by improper input neutralization during web page generation. This allows an attacker with low privileges and requiring user interaction to inject malicious scripts that can affect confidentiality, integrity, and availability to a limited extent. The CVSS 3.1 vector indicates network attack vector, low attack complexity, low privileges required, user interaction required, and scope changed, with low impact on confidentiality and integrity and low impact on availability.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the affected application, potentially leading to limited disclosure of information, modification of data, or disruption of service. The impact is rated medium based on the CVSS score of 6.5. There are no reports of active exploitation in the wild.

No official patch or remediation is currently available for this vulnerability. Users should monitor the vendor's advisory channels for updates. Until a fix is released, cautious handling of user input and applying any available temporary mitigations or input sanitization measures may reduce risk. Avoid exposing the vulnerable functionality to untrusted users where possible.