Horde Trean, as used in Horde Groupware Webmail Edition through 5.2.22 and other products, allows CSRF, as demonstrated by the treanBookmarkTags parameter to the trean/ URI on a webmail server. NOTE: treanBookmarkTags could, for example, be a stored XSS payload.
bugs.horde.org/ticket/14926
cxsecurity.com/issue/WLB-2019050199
exchange.xforce.ibmcloud.com/vulnerabilities/161333
lists.debian.org/debian-lts-announce/2019/12/msg00015.html
numanozdemir.com/respdisc/horde/horde.mp4
numanozdemir.com/respdisc/horde/horde.txt
packetstormsecurity.com/files/152975/Horde-Webmail-5.2.22-XSS-CSRF-SQL-Injection-Code-Execution.html
www.exploit-db.com/exploits/46903