CVE-2021-42330
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 “Teacher Edit” function of ShinHer StudyOnline System does not perform authority control. After logging in with user’s privilege, remote attackers can access and edit other users’ credential and personal information 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 confidenceThis is an Insecure Direct Object Reference (IDOR) vulnerability in the ShinHer StudyOnline System's 'Teacher Edit' function. The application fails to perform proper authorization checks, allowing authenticated users to access and modify other users' credentials and personal information by manipulating URL parameters. This is a broken access control vulnerability enabling horizontal privilege escalation.
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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 the application by checking for web directories containing 'xinhe', 'teaching', 'studyonline', or 'shinher' in the path, or check running services on the host for these keywordsAffected if The application is present and running on the system
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Verify the installed version is v2021Check the application's version information in its about page, configuration files, or by querying the application's API/frontend for version metadataAffected if The version is exactly v2021 (based on affected version range)
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Confirm the Teacher Edit function existsAccess the application's web interface and navigate to the teacher management or user edit sections, looking for a 'Teacher Edit' or equivalent functionAffected if The Teacher Edit functionality is present and accessible to authenticated users
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Test for missing authorization in URL parameter handlingLog in as a regular authenticated user, access the Teacher Edit function, and attempt to modify the user ID parameter in the URL to reference a different user accountAffected if The application allows modification of other user credentials or personal information by changing URL parameters without proper authorization validation
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Inspect session and authorization validation logicReview server-side code or configuration to verify if the Teacher Edit function validates that the authenticated user has permission to modify the specific user account being accessedAffected if No server-side authorization check exists to verify the authenticated user owns or has permission to edit the target user account
A user is affected if they are running Xinhe Teaching Platform System v2021 and the Teacher Edit function allows unauthorized access to other user data via URL parameter manipulation.
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 proper authorization validation in the Teacher Edit function to verify the authenticated user has appropriate permissions before allowing access or modification of user data. Use session-based validation and indirect object references rather than trusting client-supplied parameters.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42330 — 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-2021-42330 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
- No spam, self-promotion, credentials, or personal data