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lucy-xss-filter

lucy-xss-filter before commit e5826c0 allows an attacker to execute malicious JavaScript due to improper sanitization caused by misconfigured default superset rule files.

CVE-2026-23769 is a vulnerability classified under CWE-79, indicating improper neutralization of input during web page generation, commonly known as cross-site scripting (XSS). The issue resides in NAVER's lucy-xss-filter, a security component designed to sanitize user input and prevent XSS attacks. Prior to the commit identified as e5826c0, the default superset rule files used by lucy-xss-filter were misconfigured, leading to insufficient sanitization of malicious input. This misconfiguration allows attackers to craft input that bypasses the filter, resulting in the execution of arbitrary JavaScript code within the context of the victim's browser session. Such execution can lead to theft of sensitive information such as cookies, session tokens, or enable unauthorized actions on behalf of the user. The vulnerability affects all versions of lucy-xss-filter before the specified commit, though exact version numbers are not provided. No public exploits have been reported yet, but the nature of XSS vulnerabilities makes them relatively easy to exploit, especially in web applications that rely heavily on user-generated content. The lack of a CVSS score means severity must be assessed based on impact and exploitability factors. The flaw impacts confidentiality and integrity primarily, with potential secondary effects on availability if exploited to perform further attacks. The vulnerability does not require authentication or user interaction beyond visiting a maliciously crafted page, increasing its risk profile. NAVER lucy-xss-filter is used in various web applications, and organizations deploying it without the patch or proper configuration remain vulnerable.

Detailed information about CVE-2026-23769: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in NAVER lucy-xss-filter 

CVE-2026-23769: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in NAVER lucy-xss-filter - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-23769: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in NAVER lucy-xss-filter

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


CVE-2026-23769: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in NAVER lucy-xss-filterCVE-2026-23769 0 lucy-xss-filter before commit e5826c0 allows an attacker to execute malicious JavaScript due to improper sanitization caused by misconfigured default superset rule files. MediumVulnerabilityGermanyFranceUnited Kingdom+5#cve #cve-2026-23769 #cwe-79 Join the discussion	CVE Database V5	01/16/2026, 05:23:56 UTC Added: 01/16/2026, 05:28:22 UTC
CVE-2026-23768: CWE-918 Server-Side Request Forgery (SSRF) in NAVER lucy-xss-filterCVE-2026-23768 0 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. MediumVulnerabilityGermanyFranceUnited Kingdom+2#cve #cve-2026-23768 #cwe-918 Join the discussion	CVE Database V5	01/16/2026, 05:20:58 UTC Added: 01/16/2026, 05:28:22 UTC

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