It was possible for some users without permission to view other users' full names to do so via the online users block.
| Severity/Risk: | Minor |
| 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: | Ankit Agarwal |
| Workaround: | Hide the online users block (via Site administration > Plugins > Blocks > Manage blocks) until the patch has been applied. |
| CVE identifier: | CVE-2021-20281 |
| Changes (master): | http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-59293 |
| Tracker issue: | MDL-59293 User full name disclosure within online users block |
Read more https://moodle.org/mod/forum/discuss.php?d=419652&parent=1691268