Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks.
| Severity/Risk: | Serious |
| Versions affected: | 3.10 to 3.10.1, 3.9 to 3.9.4, 3.8 to 3.8.7, 3.5 to 3.5.16 and earlier unsupported versions |
| Versions fixed: | 3.10.2, 3.9.5, 3.8.8 and 3.5.17 |
| Reported by: | Holme and Rekter0 |
| CVE identifier: | CVE-2021-20280 |
| Changes (master): | http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-70767 |
| Tracker issue: | MDL-70767 Stored XSS and blind SSRF possible via feedback answer text |