Moodle up to 4.5.7/5.0.3/5.1.0 AI Prompt Response cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Moodle up to 4.5.7/5.0.3/5.1.0. This affects an unknown function of the component AI Prompt Response Handler. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2025-67849. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Moodle up to 4.5.7/5.0.3/5.1.0 and classified as problematic. This issue affects an unknown functionality of the component AI Prompt Response Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

A flaw was found in Moodle. This cross-site scripting (XSS) vulnerability, caused by improper sanitization of AI prompt responses, allows attackers to inject malicious HTML or script into web pages. When other users view these compromised pages, their sessions could be stolen, or the user interface could be manipulated.

It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2025-67849 since 12/12/2025. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 297881 (Linux Distros Unpatched Vulnerability : CVE-2025-67849), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (297881). Be aware that VulDB is the high quality source for 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
• 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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Be aware that VulDB is the high quality source for vulnerability data.

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