Moodle up to 4.5.12/5.0.8/5.1.5/5.2.1 Grade Web Service improper authorization

Summaryinfo

A vulnerability identified as problematic has been detected in Moodle up to 4.5.12/5.0.8/5.1.5/5.2.1. The affected element is an unknown function of the component Grade Web Service. Performing a manipulation results in improper authorization. This vulnerability is known as CVE-2026-102579. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Moodle up to 4.5.12/5.0.8/5.1.5/5.2.1. It has been classified as problematic. This affects some unknown functionality of the component Grade Web Service. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. The summary by CVE is:

A flaw was found in Moodle. An incorrect capability check in the grade web service allows an authenticated student to access profile information of other students enrolled in the same course that they should not have permission to view. This issue leads to unauthorized information disclosure.

The advisory is shared at git.moodle.org. This vulnerability is uniquely identified as CVE-2026-102579 since 09/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/30/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 4.5.13, 5.0.9, 5.1.6 or 5.2.2 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Learning Management Software

Name

• Moodle

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 4.5.8
• 4.5.9
• 4.5.10
• 4.5.11
• 4.5.12
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3
• 5.1.4
• 5.1.5
• 5.2.0
• 5.2.1

License

• open-source

Website

• Product: https://moodle.org/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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