Some returnurl parameters required additional sanitizing to prevent a reflected XSS risk.
| Severity/Risk: | Serious |
| Versions affected: | 4.1, 4.0 to 4.0.5, 3.11 to 3.11.11, 3.9 to 3.9.18 and earlier unsupported versions |
| Versions fixed: | 4.1.1, 4.0.6, 3.11.12 and 3.9.19 |
| Reported by: | DegrangeM |
| CVE identifier: | CVE-2023-23921 |
| Changes (master): | http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-76810 |
| Tracker issue: | MDL-76810 Reflected XSS risk in some returnurl parameters |