{"id":"CVE-2026-27447","summary":"OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup","details":"OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.","aliases":["GHSA-v987-m8hp-phj9"],"modified":"2026-04-22T20:14:25.837926063Z","published":"2026-04-03T21:11:59.734Z","related":["openSUSE-SU-2026:10589-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27447.json","cwe_ids":["CWE-863"],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27447.json"},{"type":"FIX","url":"https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220"},{"type":"ADVISORY","url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27447"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openprinting/cups","events":[{"introduced":"0"},{"last_affected":"7523763f00d2063f88026d93bc5b29806240de2b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"2.4.16"}],"source":"AFFECTED_FIELD"}}],"versions":["v2.2.0","v2.2.1","v2.2.2","v2.2.3","v2.2.4","v2.2.5","v2.2.6","v2.2b1","v2.2b2","v2.2rc1","v2.3.0","v2.3.1","v2.3.3","v2.3.3op1","v2.3.3op2","v2.3b1","v2.3b2","v2.3b3","v2.3b4","v2.3b5","v2.3b6","v2.3b7","v2.3b8","v2.3rc1","v2.4.0","v2.4.1","v2.4.10","v2.4.11","v2.4.12","v2.4.13","v2.4.14","v2.4.15","v2.4.16","v2.4.2","v2.4.3","v2.4.4","v2.4.5","v2.4.6","v2.4.7","v2.4.8","v2.4.9","v2.4b1","v2.4rc1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-27447.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N"}]}