moodle up to 5.1.0 Policy Tool cross site scripting

Summaryinfo

A vulnerability has been found in moodle up to 4.1.21/4.4.11/4.5.7/5.0.3/5.1.0 and classified as problematic. Affected is an unknown function of the component Policy Tool. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2025-67855. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

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 declared as problematic. Affected by this vulnerability is an unknown part of the component Policy Tool. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

A flaw was found in mooodle. A remote attacker could exploit a reflected Cross-Site Scripting (XSS) vulnerability in the policy tool return URL. This vulnerability arises from insufficient sanitization of URL parameters, allowing attackers to inject malicious scripts through specially crafted links. Successful exploitation could lead to information disclosure or arbitrary client-side script execution within the user's browser.

The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2025-67855 since 12/12/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. 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 02/11/2026). MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 297912 (Linux Distros Unpatched Vulnerability : CVE-2025-67855), 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 (297912). 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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