What is CVE-2026-23769?

CVE-2026-23769 is a medium-severity vulnerability in Naver Lucy-Xss-Filter, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-16.

How severe is CVE-2026-23769?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Naver Lucy-Xss-Filter

CVE-2026-23769

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (11.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Naver Lucy-Xss-Filter — versions e5826c0d26b4f546955279767bbe94e5c7ed3f15

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve.naver.com/detail/cve-2026-23769.html (vendor-advisory, Vendor Advisory)
github.com/naver/lucy-xss-filter/pull/32 (Patch, mitigation)

Frequently asked questions

What is CVE-2026-23769?: CVE-2026-23769 is a medium-severity vulnerability in Naver Lucy-Xss-Filter, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-16.
How severe is CVE-2026-23769?: Medium severity. CVSS v3 base score is 6.1 out of 10.