The YouDao plugin for StarDict, as used in stardict 3.0.7+git20220909+dfsg-6 in Debian trixie and elsewhere, sends an X11 selection to the dict.youdao.com and dict.cn servers via cleartext HTTP.
Exploitability
AV:NAC:LPR:NUI:RScope
S:CImpact
C:LI:NA:N4.7/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:NOther