CVE-2020-19290

Vulnerability

A stored cross-site scripting (XSS) vulnerability exists in the /weibo/comment component of Jeesns version 1.4.2. The application fails to properly sanitize user input when posting comments on Weibo, allowing an attacker to inject arbitrary HTML or JavaScript code that is stored on the server and later executed in the browsers of other users viewing the comment. The vulnerability is triggered when a victim visits the Weibo page containing the malicious comment [1].

Exploitation

An attacker requires only the ability to post a comment on the Weibo functionality of Jeesns 1.4.2. No special authentication level beyond normal user access is needed. The attacker crafts a comment containing malicious JavaScript or HTML payload (e.g., ``) and submits it. When other users (including administrators) browse the Weibo page, the injected script executes in their browser context [1].

Impact

Successful exploitation allows the attacker to execute arbitrary web scripts or HTML in the context of the victim's browser. This can lead to session hijacking, defacement of the Weibo page, or theft of sensitive information displayed in the browser. The impact is magnified if an administrator views the comment, potentially compromising administrative credentials or allowing further privilege escalation within the Jeesns application [1].

Mitigation

As of the publication date (2021-09-09) and according to the reference [1] (Seebug entry submitted 2019-05-14), no official patch or fixed version has been publicly released by the Jeesns developers. Users should consider implementing input validation and output encoding for the comment field, or restrict commenting to trusted users. If the application is no longer maintained, migration to a supported fork or alternative software should be evaluated.