Weblate is a web based localization tool. In versions prior to 5.15, it was possible to accept an invitation opened by a different user. Version 5.15. contains a patch. As a workaround, avoid leaving one's Weblate sessions with an invitation opened unattended.
Exploitability
AV:LAC:HAT:PPR:LUI:PVulnerable System
VC:LVI:LVA:NSubsequent System
SC:NSI:NSA:N1/CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NOther