Moodle up to 4.1.15/4.3.9/4.4.5/4.5.1 Separate Groups Mode authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in Moodle up to 4.1.15/4.3.9/4.4.5/4.5.1. Affected by this vulnerability is an unknown functionality of the component Separate Groups Mode. Performing a manipulation results in authorization. This vulnerability was named CVE-2025-26526. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Moodle up to 4.1.15/4.3.9/4.4.5/4.5.1. This affects an unknown functionality of the component Separate Groups Mode. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Separate Groups mode restrictions were not factored into permission checks before allowing viewing or deletion of responses in Feedback activities.

It is possible to read the advisory at moodle.org. This vulnerability is uniquely identified as CVE-2025-26526 since 02/12/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/09/2025).

Upgrading to version 4.1.16, 4.3.10, 4.4.6 or 4.5.2 eliminates this vulnerability.

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Productinfo

Type

• Learning Management Software

Name

• Moodle

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.1.11
• 4.1.12
• 4.1.13
• 4.1.14
• 4.1.15
• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3
• 4.3.4
• 4.3.5
• 4.3.6
• 4.3.7
• 4.3.8
• 4.3.9
• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5
• 4.5.0
• 4.5.1

License

• open-source

Website

• Product: https://moodle.org/

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