CVE-2021-42329Network attack vector

Stored XSS via unfiltered message-board titles

Published Oct 15, 2021 · Updated Sep 17, 2024

Stored XSS in ShinHer StudyOnline System 2021 and earlier allows remote authenticated users to inject JavaScript through message-board titles. The message board's List_Add function stores the title parameter without filtering special characters, causing later views to execute attacker-supplied script. A valid user account and subsequent viewing of the stored title are required; the script runs in the viewer's browser context.

CVSS severity5.4
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in ShinHer StudyOnline System 2021 and earlier allows remote authenticated users to inject JavaScript through message-board titles. The message board's List_Add function stores the title parameter without filtering special characters, causing later views to execute attacker-supplied script. A valid user account and subsequent viewing of the stored title are required; the script runs in the viewer's browser context.

The record

CVE
CVE-2021-42329
Published
Oct 15, 2021
Updated
Sep 17, 2024
Vendor
ShinHer Information Co., LTD.
Product
ShinHer StudyOnline System
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ShinHer Information Co., LTD. · ShinHer StudyOnline Systemversion=unspecified <=2021

Published CVSS scores

5.4TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Cross-site Scripting (XSS)
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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