CVE-2021-42331
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe “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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe Study Edit function in ShinHer StudyOnline System lacks proper authorization checks, allowing authenticated users to modify other users' tutorial schedules by manipulating URL parameters. This is an Insecure Direct Object Reference (IDOR) vulnerability enabling unauthorized cross-user data manipulation.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= v2021CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Xinhe Teaching Platform System is installedLocate and inspect the application's installation directory, or check running services/processes for 'Xinhe Teaching Platform', 'StudyOnline', or related executable/service namesAffected if The system running is Xinheinformation Xinhe Teaching Platform System or ShinHer StudyOnline System
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Determine the installed versionCheck the application's version information through its About page, help menu, or version file within the installation directory for 'v2021'Affected if The installed version is exactly v2021
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Locate the Study Edit functionNavigate through the web interface or application menu to find the Study Edit or tutorial schedule editing featureAffected if The Study Edit function exists and is accessible to authenticated users
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Test for IDOR vulnerability in Study EditLog in as an authenticated user, access the Study Edit function, and attempt to modify the URL parameter (such as user ID, tutorial ID, or schedule ID) to reference another user's tutorial schedule without proper authorization validationAffected if The application allows modifying another user's tutorial schedule by changing URL parameters without returning an authorization error
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Verify lack of authorization checkUse a second test account to confirm that User A can modify User B's tutorial schedule by manipulating URL parameters, and observe whether the application validates ownership before processing the edit requestAffected if The application does not verify that the authenticated user owns or has permission to modify the specific tutorial schedule being edited
A user is affected if they are running Xinheinformation Xinhe Teaching Platform System v2021 and the Study Edit function allows modifying other users' tutorial schedules by manipulating URL parameters without authorization validation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement server-side authorization validation to verify the authenticated user owns or has permission to modify the specific tutorial schedule before processing any edit operations.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-42331 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-42331 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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