XSS in Moodle
CVE-2025-67850
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Moodle — versions 5.1.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2025-67850 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2025-67850?
- CVE-2025-67850 is a high-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-02-03.
- How severe is CVE-2025-67850?
- High severity. CVSS v3 base score is 7.3 out of 10.