ID numbers exported in HTML data formats required additional sanitizing to prevent a local stored XSS risk. Note that the XSS was part of the locally downloaded file and not on the Moodle site's domain.
| Severity/Risk: | Minor |
| Versions affected: | 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7 and earlier unsupported versions |
| Versions fixed: | 3.11.1, 3.10.5 and 3.9.8 |
| Reported by: | Paul Holden |
| CVE identifier: | CVE-2021-36401 |
| Changes (master): | http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-71981 |
| Tracker issue: | MDL-71981 Stored XSS when exporting to data formats supporting HTML via user ID number |
Read more https://moodle.org/mod/forum/discuss.php?d=424807&parent=1710826