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Test your applicationsUpgrade Debian:11 mapserver to version 6.0.1-1 or higher.
Note: Versions mentioned in the description apply only to the upstream mapserver package and not the mapserver package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
Multiple SQL injection vulnerabilities in MapServer before 4.10.7, 5.x before 5.6.7, and 6.x before 6.0.1 allow remote attackers to execute arbitrary SQL commands via vectors related to (1) OGC filter encoding or (2) WMS time support.