MSA-21-0007: Stored XSS and blind SSRF possible via feedback answer text

by Michael Hawkins.  

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

Read more https://moodle.org/mod/forum/discuss.php?d=419651&parent=1691260