CVE-2026-96351 in Classified Listing Plugin
Summary
by MITRE • 09/30/2026
Unauthenticated Cross Site Scripting (XSS) in Classified Listing <= 6.1.3 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within the Classified Listing plugin, specifically affecting versions up to and including 6.1.3, represents a significant security risk for websites relying on this software component. This type of attack allows malicious actors to inject client-side scripts into web pages viewed by other users without requiring any form of authentication or prior login credentials. The absence of an authentication requirement means that the vulnerability is remotely exploitable and can be triggered by any internet user who interacts with the affected application, significantly lowering the barrier for entry for attackers seeking to compromise site integrity or steal sensitive data from unsuspecting visitors.
From a technical perspective, this flaw typically stems from insufficient input validation and output encoding mechanisms within the plugin's codebase. When user-supplied data is processed by the application, such as text entered into classified ad descriptions, search queries, or comment fields, it is often reflected directly back to the browser in an HTML context without proper sanitization. This allows attackers to craft malicious payloads containing JavaScript code that executes when the victim loads the compromised page. The lack of encoding ensures that the browser interprets the injected script as executable content rather than plain text, facilitating the execution of arbitrary commands within the security context of the vulnerable website.
The operational impact of this vulnerability is severe and multifaceted. Attackers can utilize cross-site scripting to perform session hijacking by stealing cookies or authentication tokens stored in the victim's browser, thereby gaining unauthorized access to user accounts even if those accounts have strong passwords. Additionally, the flaw enables phishing attacks where attackers can inject fake login forms or deceptive content that mimics legitimate site elements, tricking users into revealing sensitive information such as credit card numbers or personal identification details. In more advanced scenarios, the vulnerability can be leveraged to deface the website by altering its visual presentation or to distribute malware by redirecting victims to malicious domains hosting exploit kits.
This specific weakness aligns with Common Weakness Enumeration (CWE) identifier CWE-79, which classifies Improper Neutralization of Input During Web Page Generation as a Cross-site Scripting vulnerability. Furthermore, in the context of the MITRE ATT&CK framework, this attack vector corresponds to techniques such as Client-side Injection and potentially Credential Access via Browser Session Hijacking if session tokens are successfully exfiltrated. The unauthenticated nature of the exploit places it firmly within the initial access or persistence phases depending on how the attacker utilizes the stolen credentials or injected scripts for long-term control over compromised accounts.
Mitigation strategies must focus on immediate remediation and defensive coding practices. The most effective solution is to upgrade the Classified Listing plugin to a version newer than 6.1.3, where developers have presumably addressed these input validation gaps. If an update is not immediately available, administrators should implement strict server-side input sanitization using whitelisting approaches that only allow expected characters and data types while rejecting or escaping all other inputs. Additionally, implementing Content Security Policy headers can help mitigate the impact of successful XSS attacks by restricting the sources from which scripts are allowed to load and execute, thereby preventing many common exploitation techniques even if the underlying code flaw remains present until a patch is applied.