KDE has issued an advisory today (May 4): https://www.kde.org/info/security/advisory-20180503-1.txt The issue is fixed upstream in 5.12.6. Mageia 6 is also affected.
Whiteboard: (none) => MGA6TOO
will be done as soon as big plasma update is OU
CC: (none) => mageia
Status comment: (none) => Fixed upstream in 5.12.6
Fedora has issued an advisory for this on May 14: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/BBA6HNDKUXDXM362Y7Y4SMBROF6J25TW/
Cauldron now has 5.14.4.
Whiteboard: MGA6TOO => (none)Version: Cauldron => 6
Mageia 6 is EOL.
Resolution: (none) => OLDCC: (none) => mramboStatus: NEW => RESOLVED