XSS in Moodle
CVE-2022-50943
Moodle LMS 4.0 contains a cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting payloads through the search parameter. Attackers can inject JavaScript code via the search field in course/search.php to execute arbitrary scripts in users' browsers and steal session cookies.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.8% 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
- Moodle Lms — versions 4.0
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/51115 (Exploit, VDB Entry, exploit)
- moodle.org/ (Product, product)
- git.in.moodle.com/moodle (Product, product)
- www.vulncheck.com/advisories/moodle-lms-cross-site-scripting-via-course-search-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2022-50943?
- CVE-2022-50943 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-10.
- How severe is CVE-2022-50943?
- Medium severity. CVSS v3 base score is 6.1 out of 10.