What is CVE-2021-42329?

CVE-2021-42329 is a medium-severity vulnerability in Shinher Information Co., Ltd. Studyonline System, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-10-15.

How severe is CVE-2021-42329?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Shinher Information Co., Ltd. Studyonline System

CVE-2021-42329

The “List_Add” function of message board of ShinHer StudyOnline System does not filter special characters in the title parameter. After logging in with user’s privilege, remote attackers can inject JavaScript and execute stored XSS attacks.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-10-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Shinher Information Co., Ltd. Studyonline System — versions unspecified
Xinheinformation Xinhe Teaching Platform System — versions v2021

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.twcert.org.tw/tw/cp-132-5199-61238-1.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-42329?: CVE-2021-42329 is a medium-severity vulnerability in Shinher Information Co., Ltd. Studyonline System, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-10-15.
How severe is CVE-2021-42329?: Medium severity. CVSS v3 base score is 5.4 out of 10.