CVE-2021-20280
MEDIUMCVSS 5.4/10EPSS 1.28%
Last modified
CVE-2021-20280 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.. EPSS estimates a 1.28% chance of exploitation in the next 30 days.
Description
Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Moodle | Moodle | >= 3.5.0, < 3.5.17 |
| Moodle | Moodle | >= 3.8.0, < 3.8.8 |
| Moodle | Moodle | >= 3.9.0, < 3.9.5 |
| Moodle | Moodle | >= 3.10.0, < 3.10.2 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
References
- http://packetstormsecurity.com/files/164817/Moodle-Cross-Site-Scripting-Server-Side-Request-Forgery.htmlExploit, Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1939037Issue Tracking, Third Party Advisory
- https://moodle.org/mod/forum/discuss.php?d=419651Patch, Vendor Advisory
- http://packetstormsecurity.com/files/164817/Moodle-Cross-Site-Scripting-Server-Side-Request-Forgery.htmlExploit, Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1939037Issue Tracking, Third Party Advisory
- https://moodle.org/mod/forum/discuss.php?d=419651Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20280?
Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
How severe is CVE-2021-20280?
CVE-2021-20280 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20280?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2021-20280?
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