CVE-2025-22583 in Scan External Links Plugin
Summary
by MITRE • 01/13/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Anshul Sojatia Scan External Links allows Reflected XSS.This issue affects Scan External Links: from n/a through 1.0.
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Analysis
by VulDB Data Team • 02/13/2025
This vulnerability represents a classic reflected cross-site scripting flaw that enables attackers to inject malicious scripts into web pages viewed by other users. The vulnerability exists within the Scan External Links plugin developed by Anshul Sojatia, specifically affecting versions ranging from the initial release through version 1.0. The flaw occurs during the web page generation process where user input is not properly sanitized or escaped before being rendered back to the browser, creating an avenue for malicious code execution.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the plugin's codebase. When users interact with the plugin's functionality, particularly when processing external links, the application fails to neutralize potentially dangerous characters and script tags that could be embedded within the input parameters. This improper handling allows attackers to craft malicious URLs containing script payloads that get executed in the victim's browser context. The reflected nature of this vulnerability means that the malicious script is reflected off the web server rather than being stored, making it particularly challenging to detect and prevent through traditional security measures.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, and redirection to malicious websites. An attacker could craft a phishing link that, when clicked by a victim, would execute malicious JavaScript code in the victim's browser, potentially stealing cookies, session tokens, or other sensitive information. The vulnerability affects all users of the plugin within the specified version range, making it a significant security concern for any website utilizing this particular tool. This type of vulnerability directly maps to CWE-79 which specifically addresses cross-site scripting flaws, and aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments or links.
Mitigation strategies for this vulnerability should include immediate implementation of proper input sanitization and output encoding measures. Developers must ensure that all user-provided data is properly escaped before being rendered in web pages, utilizing context-appropriate encoding mechanisms such as HTML entity encoding for display contexts. The plugin should implement comprehensive input validation that rejects or sanitizes potentially dangerous characters and script tags. Additionally, implementing a Content Security Policy (CSP) header can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Users should be advised to upgrade to the latest version of the plugin as soon as a patched release becomes available, while administrators should monitor their systems for any suspicious activity that might indicate exploitation attempts. The vulnerability also highlights the importance of regular security audits and code reviews to identify and remediate similar issues before they can be exploited in production environments.