CVE-2026-25349 in Loobek Plugin
Summary
by MITRE • 03/25/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in skygroup Loobek loobek allows Reflected XSS.This issue affects Loobek: from n/a through < 1.5.2.
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Analysis
by VulDB Data Team • 03/31/2026
The vulnerability identified as CVE-2026-25349 represents a critical cross-site scripting flaw within the skygroup Loobek loobek web application, specifically impacting versions prior to 1.5.2. This reflected cross-site scripting vulnerability occurs when the application fails to properly sanitize user input before incorporating it into dynamically generated web pages. The flaw enables attackers to inject malicious scripts into web pages viewed by other users, creating a persistent security risk that can be exploited across multiple sessions and user interactions.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the Loobek application's web page generation process. When user-supplied data is directly processed and rendered in web responses without proper sanitization, malicious payloads can be executed in the context of other users' browsers. This reflected nature means that the malicious script is executed as part of the HTTP response that the server sends back to the user, typically through parameters in the URL or form data that are not properly escaped or validated. The vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications, where insufficient validation of user inputs leads to script execution in the victim's browser context.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it can enable attackers to perform a wide range of malicious activities including credential theft, data exfiltration, and privilege escalation within the application. An attacker could craft malicious URLs that, when clicked by authenticated users, would execute scripts that steal session cookies, redirect users to phishing sites, or manipulate application functionality. The reflected nature of this XSS vulnerability means that exploitation requires user interaction with a crafted link, making it particularly dangerous in social engineering campaigns where users might be tricked into clicking malicious URLs. This vulnerability directly aligns with ATT&CK technique T1566 which covers social engineering tactics involving the delivery of malicious payloads through web-based attacks.
Organizations utilizing affected versions of Loobek should prioritize immediate remediation through the application of the vendor-provided patch or upgrade to version 1.5.2 and later. The mitigation strategy should include implementing comprehensive input validation at multiple layers of the application architecture, including client-side and server-side validation, along with robust output encoding mechanisms. Security measures should also incorporate regular security testing including automated scanning and manual penetration testing to identify similar vulnerabilities in other components of the web application stack. Additionally, implementing a content security policy can provide an additional layer of protection against XSS attacks by restricting script execution and controlling the sources from which content can be loaded.