EUVD-2025-208946
GHSA-79wq-mgjf-5cc2
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
A Cross-Site Scripting (XSS) vulnerability exists in Znuny::ITSM 6.5.x in the customer.pl endpoint via the OTRSCustomerInterface parameter
AnalysisAI
A Cross-Site Scripting (XSS) vulnerability exists in Znuny::ITSM 6.5.x where the customer.pl endpoint improperly handles the OTRSCustomerInterface parameter, allowing attackers to inject and execute arbitrary JavaScript in the context of victim browsers. This affects Znuny ITSM versions in the 6.5.x release line, and a proof-of-concept exploit has been publicly disclosed on GitHub, indicating active awareness and potential exploitation capability in the threat landscape.
Technical ContextAI
The vulnerability is rooted in improper input validation and output encoding in a web application parameter handler. Specifically, the OTRSCustomerInterface parameter passed to the customer.pl endpoint in Znuny::ITSM fails to sanitize or properly encode user-supplied input before reflecting it back in HTTP responses. This is a classic reflected XSS vulnerability (CWE category: Improper Neutralization of Input During Web Page Generation). Znuny is an open-source IT Service Management (ITSM) and help desk ticketing system built on the OTRS framework. The affected component (customer.pl) is the customer-facing interface endpoint responsible for handling customer interactions, making it a high-value attack surface for phishing, credential harvesting, and malware distribution campaigns.
RemediationAI
Immediately upgrade Znuny::ITSM to a patched version released after this vulnerability disclosure; check http://znuny.com and http://znunyitsm.com for official security advisories and version numbers. As a temporary mitigation pending patching, implement input validation and output encoding on the OTRSCustomerInterface parameter by deploying a Web Application Firewall (WAF) rule that blocks requests containing script-like payloads (e.g., javascript:, <script>, onerror=), enforce Content-Security-Policy (CSP) headers to restrict script execution origins, and restrict access to the customer.pl endpoint to known trusted IP ranges if operationally feasible. Additionally, apply HTTPS with HSTS to prevent man-in-the-middle payload injection, and monitor access logs for suspicious parameter values.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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