Moodle up to 5.1.0 Badge improper authorization

Summaryinfo

A vulnerability identified as critical has been detected in Moodle up to 4.1.21/4.4.11/4.5.7/5.0.3/5.1.0. This affects an unknown part of the component Badge Handler. The manipulation leads to improper authorization. This vulnerability is documented as CVE-2025-67856. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Moodle up to 4.1.21/4.4.11/4.5.7/5.0.3/5.1.0. It has been rated as critical. This issue affects some unknown functionality of the component Badge Handler. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in Moodle. An authorization logic flaw, specifically due to incomplete role checks during the badge awarding process, allowed badges to be granted without proper verification. This could enable unauthorized users to obtain badges they are not entitled to, potentially leading to privilege escalation or unauthorized access to certain features.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2025-67856 since 12/12/2025. The exploitation is known to be easy. The attack may be initiated 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 02/27/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 297897 (Linux Distros Unpatched Vulnerability : CVE-2025-67856), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.1.22, 4.4.12, 4.5.8, 5.0.4 or 5.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (297897). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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
• 4.1.16
• 4.1.17
• 4.1.18
• 4.1.19
• 4.1.20
• 4.1.21
• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5
• 4.4.6
• 4.4.7
• 4.4.8
• 4.4.9
• 4.4.10
• 4.4.11
• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 5.0
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.1.0

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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