xSANE 0.81 and earlier allows local users to modify files of other xSANE users via a symlink attack on temporary files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7714
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-0870
http://www.securityfocus.com/bid/3700
http://www.securityfocus.com/advisories/3734