CVE-2026-23769
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-16

Last updated on: 2026-01-16

Assigner: Naver Corporation

Description
lucy-xss-filter before commit e5826c0 allows an attacker to execute malicious JavaScript due to improper sanitization caused by misconfigured default superset rule files.
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Meta Information
Published
2026-01-16
Last Modified
2026-01-16
Generated
2026-06-16
AI Q&A
2026-01-16
EPSS Evaluated
2026-06-14
NVD
CVE-2026-23769
EUVD
EUVD-2026-2945
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
naver lucy-xss-filter to 2025-06-09 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability in lucy-xss-filter occurs because of improper sanitization due to misconfigured default superset rule files. It allows an attacker to execute malicious JavaScript, leading to a cross-site scripting (XSS) issue. [1]

Impact Analysis

The vulnerability can allow attackers to execute malicious JavaScript in the context of a vulnerable application, potentially leading to unauthorized actions, data theft, session hijacking, or other malicious activities that compromise user security. [1]

Mitigation Strategies

To mitigate this vulnerability, update the lucy-xss-filter to include the enhanced superset rules that improve filtering of URI-valued attributes, especially for 'formaction' and 'action' attributes in form tags. This involves applying the fixes introduced in the pull request #32 merged on June 8, 2025, which strengthens the XSS filtering rules. Since the repository is archived and read-only as of June 9, 2025, ensure you use the latest patched version or apply the relevant rule updates manually if possible. [1]

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