BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.Referenceshttps://www.redteam-pentesting.de/advisories/rt-sa-2020-005https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.htmlhttp://packetstormsecurity.com/files/159667/BigBlueButton-2.2.25-File-Disclosure-Server-Side-Request-Forgery.htmlhttps://github.com/bigbluebutton/bigbluebutton/commit/71fe1eac1e5bd73a2cd44bd79c001086b250e435https://github.com/bigbluebutton/bigbluebutton/compare/v2.2.26...v2.2.27
