YesWiki Cross-Site Scripting Scanner

YesWiki is an open-source content management system frequently used by small to medium-sized organizations for creating collaborative websites. Developed with simplicity in mind, it is popular among users with limited technical expertise, providing a straightforward platform to manage web pages. Its flexibility and range of plugins support various functionalities, making it a versatile tool for basic to moderately complex web projects. Despite its ease of use, YesWiki requires constant attention to security updates to ensure safety from vulnerabilities. The platform often attracts users looking for cost-effective, customizable, and easy-to-manage website solutions. It is crucial for administrators to stay informed about the latest security patches to protect sensitive data and prevent unauthorized access.

Cross-Site Scripting (XSS) is a type of security vulnerability commonly found in web applications that allows attackers to inject malicious scripts into content from otherwise trusted websites. It affects a wide variety of web applications and can be exploited to steal user cookies, hijack sessions, and perform actions on behalf of the compromised user. XSS vulnerabilities arise when an application includes untrusted data in a web page without proper validation or escaping. Reflected XSS occurs when the payload has to be part of the request sent to the web server. Malicious scripts execute in the context of the user's browser, without the user's knowledge, thus posing significant security threats. Stay vigilant against XSS to protect users and maintain the integrity of web applications.

This vulnerability affects specific endpoints within YesWiki, primarily involving the injection of scripts into URL parameters. Attackers can execute scripts by abusing endpoints like `PagePrincipale/listpages` where input fields or parameters may not be properly sanitized. The threat primarily lies in the application's response to crafted requests that include malicious script tags. Upon execution, these scripts operate within the application context, potentially contacting or manipulating the associated web session. The vulnerable parameter typically accepts input that is inadequately sanitized, thereby enabling the injection and subsequent execution of JavaScript. The exploitation of such vulnerabilities in YesWiki could allow attackers to compromise user data, deface content, or inject further malicious logic into the site.

Exploiting this vulnerability could have severe ramifications for both users and administrators of the affected YesWiki instance. Users may find themselves victims of data theft, such as session cookies, leading to identity theft or unauthorized actions being performed in their name. Administrators might see their content altered, defaced, or injected with unwanted advertisements or misinformation. In worse scenarios, attackers could extend their reach to affect other users visiting the compromised site, spreading malicious payloads or capturing more sensitive data. Such security breaches often undermine user trust in the affected website, damaging reputations and potentially causing financial losses due to unauthorized transactions or downtime.

REFERENCES

• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-5724-x3rh-5qqq