CVE-2020-19281

Vulnerability

A stored cross-site scripting (XSS) vulnerability exists in Jeesns version 1.4.2 within the /manage/loginusername component. The application fails to sanitize the username input, allowing an attacker to inject arbitrary web scripts or HTML via a crafted payload in the username field. This payload is stored and later executed when the username is rendered in the administrative interface [1].

Exploitation

An attacker can exploit this vulnerability by submitting a malicious payload as the username during the login process on the /manage/loginusername page. No authentication is required to access the login page, but the payload will be stored and executed when an administrator views the affected user data. The attacker does not need any special privileges beyond network access to the Jeesns instance.

Impact

Successful exploitation allows the attacker to execute arbitrary JavaScript or HTML in the context of an administrator's browser session. This can lead to session hijacking, defacement, theft of sensitive information, or further compromise of the Jeesns application.

Mitigation

As of the publication date (2021-09-09), no official patch has been released for Jeesns 1.4.2. Users are advised to implement input validation and output encoding for the username field, or upgrade to a newer version if available. The issue is tracked in the project's GitHub repository [1].