Improper Sanitization in Naver's Lucy XSS Filter Allows JavaScript Execution
CVE-2026-23769

6.5MEDIUM

Key Information:

Vendor

Naver

Status
Lucy-xss-filter
Vendor
CVE Published:
16 January 2026

What is CVE-2026-23769?

The Naver Lucy XSS Filter is susceptible to an issue that allows attackers to execute unauthorized JavaScript code. This vulnerability arises from improper sanitization due to misconfigured default superset rule files, which may allow attackers to manipulate the filtering process. This issue emphasizes the importance of proper configuration and validation to mitigate potential security risks.

Affected Version(s)

lucy-xss-filter e5826c0d26b4f546955279767bbe94e5c7ed3f15

References

https://cve.naver.com/detail/cve-2026-23769.html
vendor-advisory
https://github.com/naver/lucy-xss-filter/pull/32
mitigation

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Younghun Ko of AhnLab
.