CVE-2025-67850
HIGHCVE-2025-67850 is a high-severity (CVSS 7.3) Cross-site Scripting (XSS) vulnerability in moodle/moodle. O3 Security confirms whether CVE-2025-67850 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Moodle: moodle: cross-site scripting vulnerability via inadequate input filtering in formula editor
Blast Radius
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 vulnerability, known as Cross-Site Scripting (XSS), occurs due to insufficient checks on user-provided data in the formula editor's arithmetic expression fields. A remote attacker could inject malicious code into these fields. When other users view these expressions, the malicious code would execute in their web browsers, potentially compromising their data or leading to unauthorized actions.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | moodle/moodle | all versions | 4.1.22 |
| 🐘Packagist | moodle/moodle | ≥ 4.4.0-beta&&< 4.4.12 | 4.4.12 |
| 🐘Packagist | moodle/moodle | ≥ 4.5.0-beta&&< 4.5.8 | 4.5.8 |
| 🐘Packagist | moodle/moodle | ≥ 5.0.0-beta&&< 5.0.4 | 5.0.4 |
| 🐘Packagist | moodle/moodle | ≥ 5.1.0-beta&&< 5.1.1 | 5.1.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moodle/moodle. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
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-2025-67850 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2025-67850 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2025-67850. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2025-67850 in your dependencies?
O3 detects CVE-2025-67850 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.