Moodle up to 4.5.12/5.0.8/5.1.5/5.2.1 Password Reset Page cross site scripting

Summaryinfo

A vulnerability was found in Moodle up to 4.5.12/5.0.8/5.1.5/5.2.1 and classified as problematic. This issue affects some unknown processing of the component Password Reset Page. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-102586. The attack may be launched remotely. There is no exploit available. It is suggested to 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. Affected is an unknown code of the component Password Reset Page. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. CVE summarizes:

A flaw was found in Moodle. Insufficient sanitization of username input on the password reset page allows a remote attacker to conduct a cross-site scripting (XSS) attack. By convincing an unauthenticated user to access a specially crafted password reset link, an attacker could execute arbitrary script in the victim's browser.

The advisory is available at git.moodle.org. This vulnerability is traded as CVE-2026-102586 since 09/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/30/2026). This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-89725). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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