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lucy-xss-filter before commit 7c1de6d allows an attacker to induce server-side HEAD requests to arbitrary URLs when the ObjectSecurityListener or EmbedSecurityListener option is enabled and embed or object tags are used with a src attribute missing a file extension.

CVE-2026-23768 is a Server-Side Request Forgery (SSRF) vulnerability identified in NAVER's lucy-xss-filter, a security filter designed to prevent cross-site scripting (XSS) attacks. The vulnerability arises when either the ObjectSecurityListener or EmbedSecurityListener options are enabled, and an attacker crafts embed or object HTML tags with a src attribute that lacks a file extension. Under these conditions, the filter improperly processes the src attribute and triggers a server-side HEAD HTTP request to an arbitrary URL specified by the attacker. This SSRF flaw allows attackers to make the vulnerable server initiate HTTP requests to internal or external systems, potentially bypassing network access controls or firewall restrictions. The impact of such requests can include reconnaissance of internal services, access to sensitive metadata endpoints, or leveraging the server as a proxy for further attacks. The vulnerability affects versions of lucy-xss-filter before the commit identified as 7c1de6d, with no specific version range provided. No public exploits have been reported yet, and no CVSS score has been assigned. The vulnerability is categorized under CWE-918, which covers SSRF issues. The absence of a file extension in the src attribute is a key trigger, indicating that the filter's validation logic is insufficiently strict. This flaw highlights the risks of server-side components that process user-supplied URLs without proper validation or access controls. Since lucy-xss-filter is used to enhance web application security, its compromise ironically introduces a new attack vector that could undermine internal network security and confidentiality.

Detailed information about CVE-2026-23768: CWE-918 Server-Side Request Forgery (SSRF) in NAVER lucy-xss-filter affecting NAVER lucy-xss-filter. Get real-time up

CVE-2026-23768: CWE-918 Server-Side Request Forgery (SSRF) in NAVER lucy-xss-filter - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-23768: CWE-918 Server-Side Request Forgery (SSRF) in NAVER lucy-xss-filter

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