CVE-2026-2547 identifies a cross-site scripting vulnerability in LigeroSmart, a helpdesk and ticketing software widely used for IT service management. The vulnerability resides in the AgentDashboard function of the /otrs/index.pl script, specifically through improper sanitization of the Subaction parameter. An attacker can craft a malicious URL or payload that, when processed by the vulnerable function, injects arbitrary JavaScript code into the web interface. This XSS flaw is remotely exploitable without requiring authentication, though it does require user interaction such as clicking a malicious link. The vulnerability has a CVSS 4.0 base score of 5.1, reflecting medium severity due to the ease of exploitation and limited impact scope. The exploit code has been publicly disclosed, increasing the risk of opportunistic attacks. LigeroSmart versions from 6.1.0 through 6.1.26 are affected, and as of the publication date, no official patch or mitigation has been released by the vendor. The vulnerability could allow attackers to hijack user sessions, steal credentials, or perform actions on behalf of legitimate users, undermining confidentiality and integrity of the affected systems. The lack of vendor response and public exploit availability heighten the urgency for organizations to implement interim mitigations.

For European organizations, the impact of this XSS vulnerability can be significant, especially for entities relying on LigeroSmart for internal IT service management or customer support portals. Successful exploitation could lead to session hijacking, unauthorized access to sensitive ticketing data, and potential lateral movement within internal networks. Confidential information such as user credentials, internal communications, and support tickets could be exposed or manipulated. This may result in operational disruptions, data breaches, and reputational damage. Additionally, attackers could use the vulnerability as a foothold to deploy further attacks or malware. Organizations in regulated sectors such as finance, healthcare, and government are particularly vulnerable due to strict data protection requirements under GDPR. The medium severity rating indicates that while the vulnerability is not critical, it still poses a tangible risk that should be addressed promptly to prevent exploitation.

Given the absence of an official patch, European organizations should implement specific mitigations: 1) Employ web application firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the Subaction parameter. 2) Restrict access to the AgentDashboard interface to trusted networks or VPNs to reduce exposure. 3) Implement strict Content Security Policy (CSP) headers to limit the execution of injected scripts. 4) Conduct input validation and sanitization on the server side if possible, or deploy reverse proxies that can filter malicious inputs. 5) Educate users about the risks of clicking untrusted links and encourage cautious behavior. 6) Monitor logs for unusual activity related to the Subaction parameter or AgentDashboard access. 7) Plan for rapid deployment of vendor patches once released. 8) Consider temporary disabling or limiting functionality of the vulnerable component if feasible. These targeted actions go beyond generic advice and address the specific attack vector and environment.