XSS in Moodle
CVE-2021-43558
A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.
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: 0.009 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000
Affected products
- Moodle
- Fedoraproject Extra Packages For Enterprise Linux — versions 7.0
- Fedoraproject Fedora — versions 35
- Moodle — versions moodle 3.11.4, moodle 3.10.8 and moodle 3.9.11
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- moodle.org/mod/forum/discuss.php (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-43558?
- CVE-2021-43558 is a medium-severity vulnerability in Moodle, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-22.
- How severe is CVE-2021-43558?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-43558 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.