CVE-2025-6639Network attack vector

Assignment disclosure and modification via unchecked object key

Published Oct 25, 2025 · Updated Oct 25, 2025

Improper authorization in Themeum Tutor LMS Pro 3.8.3 and earlier allows remote authenticated users to view and edit other students' assignments. The tutor_assignment_submit() function accepts a user-controlled assignment key without verifying that the current account owns the referenced submission. Subscriber-level access is sufficient to read and modify another student's assignment submission.

CVSS severity5.4
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Themeum Tutor LMS Pro 3.8.3 and earlier allows remote authenticated users to view and edit other students' assignments. The tutor_assignment_submit() function accepts a user-controlled assignment key without verifying that the current account owns the referenced submission. Subscriber-level access is sufficient to read and modify another student's assignment submission.

The record

CVE
CVE-2025-6639
Published
Oct 25, 2025
Updated
Oct 25, 2025
Vendor
Themeum
Product
Tutor LMS Pro
Classifications
CWE-285, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 2025Record 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=* <=3.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Themeum · Tutor LMS Proversion=* <=3.8.3

Published CVSS scores

5.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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-285Improper Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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