CVE-2025-67849 is a high-severity (CVSS 7.3) Cross-site Scripting (XSS) vulnerability in moodle/moodle. A fix is available for moodle/moodle — see the affected versions and patch details below.
Moodle: moodle: cross-site scripting (xss) via improper sanitization of ai prompt responses
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-67849.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
moodle/moodle🐘moodle/moodle🐘moodle/moodle🐘moodle/moodle🐘moodle/moodleReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | moodle/moodle | all versions | 4.1.22composer require moodle/moodle:^4.1.22 |
| 🐘Packagist | moodle/moodle | ≥ 4.4.0-beta&&< 4.4.12 | 4.4.12composer require moodle/moodle:^4.4.12 |
| 🐘Packagist | moodle/moodle | ≥ 4.5.0-beta&&< 4.5.8 | 4.5.8composer require moodle/moodle:^4.5.8 |
| 🐘Packagist | moodle/moodle | ≥ 5.0.0-beta&&< 5.0.4 | 5.0.4composer require moodle/moodle:^5.0.4 |
| 🐘Packagist | moodle/moodle | ≥ 5.1.0-beta&&< 5.1.1 | 5.1.1composer require moodle/moodle:^5.1.1 |
Affected Products
moodlemoodleDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update moodle/moodle to 4.1.22 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-67849 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2025-67849 in your dependencies?
Find it across Packagist, including transitive dependencies.