{"id":"DEBIAN-CVE-2026-21881","details":"Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.","modified":"2026-05-07T20:01:46.846562Z","published":"2026-01-08T02:15:53.803Z","withdrawn":"2026-05-07T20:01:46.846562Z","upstream":["CVE-2026-21881"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-21881"}],"affected":[{"package":{"name":"kanboard","ecosystem":"Debian:14","purl":"pkg:deb/debian/kanboard?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.49+ds-1"}]}],"versions":["1.2.22+ds-1","1.2.23+ds-1","1.2.23+ds-1.1","1.2.25+ds-1","1.2.25+ds-2","1.2.25+ds-3","1.2.26+ds-1","1.2.26+ds-2","1.2.26+ds-3","1.2.26+ds-4","1.2.30+ds-1","1.2.31+ds-1","1.2.31+ds2-1","1.2.44+ds-1","1.2.47+ds-1","1.2.47+ds-2","1.2.48+ds-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21881.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}