KNR Author List Widget Cross-Site Scripting Scanner

The KNR Author List Widget is a tool designed for WordPress websites, allowing users to display a list of authors within their site. It is primarily used by website administrators who manage multi-author blogs or publications. This plugin facilitates the organization and presentation of author information, enhancing user navigation and interaction with author-related content. Widely adopted among content-heavy sites, the KNR Author List Widget integrates seamlessly into the WordPress ecosystem. By leveraging this tool, sites increase their functionality and strengthen their community of authors. Despite its advantages, certain vulnerabilities can present risks if not addressed promptly.

Cross-Site Scripting (XSS) is a type of vulnerability that occurs when an attacker is able to inject malicious scripts into content that is viewed by other users. Exploiting XSS vulnerabilities typically allows attackers to bypass access controls, impersonate users, or execute unwanted actions on behalf of users. In the case of the KNR Author List Widget, this vulnerability arises in the listItem[] parameter. As a result, malicious actors can execute arbitrary JavaScript in the context of users visiting the affected site. This exploit affects the integrity and confidentiality of browsing sessions.

The technical issue lies in the KNR Author List Widget's handling and presentation of user-supplied data, especially through parameters such as listItem[]. The lack of proper output encoding or input validation allows attackers to insert script tags, which are then rendered executable by any web browsers viewing the scripts. A common way this might be demonstrated is by entering payloads like `<script>alert(document.domain)</script>`, which, if executed, confirms an XSS vulnerability. Attackers leveraging this flaw can conduct further attacks or exploitations on the targeted web server.

If successfully exploited, this vulnerability can pose several serious threats to a compromised site. Visitors to the affected site could unknowingly download malware, end up on a phishing page, or have their credentials stolen via session hijacking. This compromises user data and puts privacy at risk. Trust in the website may be undermined if users are repeatedly subjected to unwanted content or security prompts, leading to potential revenue or traffic loss for site operators. Administrators could also find themselves battling increased support requests and diminished user confidence.

REFERENCES

• https://wordpress.org/plugins/knr-author-list-widget/