dbcve.org
Improper AuthorizationWeakness · CWE-285

CVE-2025-6639

MEDIUM · 5.4 CVSS v3.1 Published 2025-10-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
60/100
Remediation priority · Elevated
Remotely reachable Zero-click

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 · unedited
The Tutor LMS Pro – eLearning and online course solution plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.8.3 due to missing validation on a user controlled key when viewing and editing assignments through the tutor_assignment_submit() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to view and edit assignment submissions of other students.

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 confidence

The Tutor LMS Pro WordPress plugin fails to validate user ownership in the tutor_assignment_submit() function. Authenticated users with Subscriber-level access can manipulate assignment IDs to view and modify submissions belonging to other students, due to missing authorization checks on a user-controlled parameter.

MitigationUpdate to version 3.8.4 or later which includes proper authorization validation. Until then, limit subscriber-level account creation and monitor for suspicious assignment access patterns.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify Tutor LMS Pro version
    In WordPress admin, go to Plugins > Installed Plugins and locate Tutor LMS Pro. The version number is displayed below the plugin name. Alternatively, check the plugin header in /wp-content/plugins/tutor-lms-pro/tutor-pro.php for 'Version:'
    Affected if Version is lower than 3.8.4 (the fix includes proper authorization validation)
  2. Confirm assignment feature is active
    Check if any course on the site has assignments enabled. In Tutor LMS, assignments are created per course. Look for courses with the Assignment addon active or check if /tutor-assignment/ endpoint is accessible
    Affected if Assignments are created and accessible; the vulnerability allows unauthorized access to any assignment submission
  3. Enumerate subscriber-level users
    In WordPress admin, go to Users > All Users and filter by 'Subscriber' role. Count how many subscriber accounts exist. These users can exploit the flaw with minimal privileges
    Affected if Any subscriber-level user accounts exist on the site
  4. Review assignment submission access logs
    Check server access logs (Apache/nginx) or WordPress activity logs for requests to assignment-related URLs (contains 'assignment_id' parameter) where the user ID does not match the submission owner. Look for patterns like /tutor_assignment_submit/ with manipulated IDs
    Affected if Logs show assignment access from users who do not own the submission, or unusual assignment_id parameter values
  5. Audit assignment submission ownership
    Query the WordPress database: SELECT ID, post_author, post_title FROM wp_posts WHERE post_type = 'tutor_assignment' AND post_status = 'publish'; then compare post_author against any submitted meta. Check if non-owners can access /wp-json/tutor/v1/assignment/submissions?assignment_id=X
    Affected if Submissions are visible to or modifiable by users who did not create them

The environment is affected if Tutor LMS Pro version is below 3.8.4 AND the site has both active assignments AND subscriber-level users who could exploit the missing authorization check in tutor_assignment_submit().

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update to version 3.8.4 or later which includes proper authorization validation. Until then, limit subscriber-level account creation and monitor for suspicious assignment access patterns.

Recommended fix High confidence

Upgrade to the latest version of Tutor LMS Pro (version higher than 3.8.3)

  1. 1. Log in to the WordPress admin dashboard with administrator privileges
  2. 2. Navigate to Plugins > Installed Plugins
  3. 3. Locate 'Tutor LMS Pro – eLearning and online course solution' in the plugin list
  4. 4. Check the current installed version (visible under the plugin name)
  5. 5. If the installed version is 3.8.3 or below, click 'Update Now' to install the latest available version
  6. 6. After updating, verify the new version number reflects the update
  7. 7. Test that assignment submissions can only be viewed and edited by the original submitter

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing5.0 h
  • Review / QA3.0 h
17.0 hours of engineering $2,970
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-6639 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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