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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | moodle | 4.1.0 – < 4.1.22, 4.4.0 – < 4.4.12, 4.5.0 – < 4.5.8, 5.0.0 – < 5.0.4, 5.1.0 – < 5.1.1 | 4.1.22 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | moodle | No fix yet | — |
| Ubuntu Pro 16.04 LTS | moodle | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | moodle/moodle | < 4.1.22 | 4.1.22 | GHSA-6mmv-f6c6-v6q8 |
| Packagist | moodle/moodle | >= 4.4.0-beta, < 4.4.12 | 4.4.12 | GHSA-6mmv-f6c6-v6q8 |
| Packagist | moodle/moodle | >= 4.5.0-beta, < 4.5.8 | 4.5.8 | GHSA-6mmv-f6c6-v6q8 |
| Packagist | moodle/moodle | >= 5.0.0-beta, < 5.0.4 | 5.0.4 | GHSA-6mmv-f6c6-v6q8 |
| Packagist | moodle/moodle | >= 5.1.0-beta, < 5.1.1 | 5.1.1 | GHSA-6mmv-f6c6-v6q8 |
Advisories 1
- WID-SEC-2025-2851 Moodle: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 3, 2026
References
- https://access.redhat.com/security/cve/CVE-2025-67850 vdb-entry
- RHBZ#2423838 issue-tracking