CVE-2026-6965Network attack vector

Cross-course content compromise via attacker-controlled course ID

Published May 13, 2026 · Updated May 13, 2026

IDOR in Themeum Tutor LMS 3.9.9 and earlier allows remote authenticated users to alter or delete other instructors' course content. get_course_id_by() treats the course GET parameter as the owning course ID, so can_user_manage() checks membership against an attacker-selected course instead of the target object's course. Instructor-level access is required; successful requests can delete lessons, quizzes and attempts, change grades, or read unpublished material in another instructor's course.

CVSS severity5.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IDOR in Themeum Tutor LMS 3.9.9 and earlier allows remote authenticated users to alter or delete other instructors' course content. get_course_id_by() treats the course GET parameter as the owning course ID, so can_user_manage() checks membership against an attacker-selected course instead of the target object's course. Instructor-level access is required; successful requests can delete lessons, quizzes and attempts, change grades, or read unpublished material in another instructor's course.

The record

CVE
CVE-2026-6965
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Themeum
Product
Tutor LMS
Classifications
CWE-639, T1565.001, T1485
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record 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=0 <=3.9.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Themeum · Tutor LMSversion=0 <=3.9.9

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation
T1485Data Destruction

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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