{"id":"UBUNTU-CVE-2026-87876","details":"Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.","modified":"2026-09-16T14:03:45.681305402Z","published":"2026-09-09T17:17:00Z","upstream":["CVE-2026-87876"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-87876"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-87876"},{"type":"REPORT","url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2"}],"affected":[{"package":{"name":"cups","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/cups?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.0-4ubuntu3","2.1.0-5","2.1.0-6","2.1.0-6ubuntu1","2.1.0-7","2.1.2-1","2.1.2-2","2.1.3-1","2.1.3-1build1","2.1.3-3","2.1.3-4","2.1.3-4ubuntu0.2","2.1.3-4ubuntu0.3","2.1.3-4ubuntu0.4","2.1.3-4ubuntu0.5","2.1.3-4ubuntu0.6","2.1.3-4ubuntu0.7","2.1.3-4ubuntu0.8","2.1.3-4ubuntu0.9","2.1.3-4ubuntu0.10","2.1.3-4ubuntu0.11","2.1.3-4ubuntu0.11+esm1","2.1.3-4ubuntu0.11+esm2","2.1.3-4ubuntu0.11+esm3","2.1.3-4ubuntu0.11+esm4","2.1.3-4ubuntu0.11+esm5","2.1.3-4ubuntu0.11+esm6","2.1.3-4ubuntu0.11+esm7","2.1.3-4ubuntu0.11+esm8","2.1.3-4ubuntu0.11+esm9","2.1.3-4ubuntu0.11+esm11","2.1.3-4ubuntu0.11+esm12","2.1.3-4ubuntu0.11+esm13"],"ecosystem_specific":{"binaries":[{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"cups"},{"binary_name":"cups-bsd","binary_version":"2.1.3-4ubuntu0.11+esm13"},{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"cups-client"},{"binary_name":"cups-common","binary_version":"2.1.3-4ubuntu0.11+esm13"},{"binary_name":"cups-core-drivers","binary_version":"2.1.3-4ubuntu0.11+esm13"},{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"cups-daemon"},{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"cups-ipp-utils"},{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"cups-ppdc"},{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"cups-server-common"},{"binary_name":"libcups2","binary_version":"2.1.3-4ubuntu0.11+esm13"},{"binary_name":"libcupscgi1","binary_version":"2.1.3-4ubuntu0.11+esm13"},{"binary_name":"libcupsimage2","binary_version":"2.1.3-4ubuntu0.11+esm13"},{"binary_version":"2.1.3-4ubuntu0.11+esm13","binary_name":"libcupsmime1"},{"binary_name":"libcupsppdc1","binary_version":"2.1.3-4ubuntu0.11+esm13"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87876.json"}},{"package":{"name":"cups","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/cups?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.4-7ubuntu2","2.2.5-2","2.2.6-2","2.2.6-3","2.2.6-4","2.2.6-5","2.2.7-1ubuntu1","2.2.7-1ubuntu2","2.2.7-1ubuntu2.1","2.2.7-1ubuntu2.2","2.2.7-1ubuntu2.3","2.2.7-1ubuntu2.4","2.2.7-1ubuntu2.5","2.2.7-1ubuntu2.6","2.2.7-1ubuntu2.7","2.2.7-1ubuntu2.8","2.2.7-1ubuntu2.9","2.2.7-1ubuntu2.10","2.2.7-1ubuntu2.10+esm1","2.2.7-1ubuntu2.10+esm2","2.2.7-1ubuntu2.10+esm3","2.2.7-1ubuntu2.10+esm4","2.2.7-1ubuntu2.10+esm5","2.2.7-1ubuntu2.10+esm6","2.2.7-1ubuntu2.10+esm7","2.2.7-1ubuntu2.10+esm9","2.2.7-1ubuntu2.10+esm10"],"ecosystem_specific":{"binaries":[{"binary_name":"cups","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_name":"cups-bsd","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_version":"2.2.7-1ubuntu2.10+esm10","binary_name":"cups-client"},{"binary_name":"cups-common","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_version":"2.2.7-1ubuntu2.10+esm10","binary_name":"cups-core-drivers"},{"binary_version":"2.2.7-1ubuntu2.10+esm10","binary_name":"cups-daemon"},{"binary_version":"2.2.7-1ubuntu2.10+esm10","binary_name":"cups-ipp-utils"},{"binary_name":"cups-ppdc","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_name":"cups-server-common","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_name":"libcups2","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_name":"libcupscgi1","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_name":"libcupsimage2","binary_version":"2.2.7-1ubuntu2.10+esm10"},{"binary_version":"2.2.7-1ubuntu2.10+esm10","binary_name":"libcupsmime1"},{"binary_name":"libcupsppdc1","binary_version":"2.2.7-1ubuntu2.10+esm10"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87876.json"}},{"package":{"name":"cups","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/cups?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.12-2ubuntu1","2.3.0-6","2.3.0-7","2.3.0-7ubuntu1","2.3.1-1ubuntu1","2.3.1-2","2.3.1-4","2.3.1-7","2.3.1-9ubuntu1","2.3.1-9ubuntu1.1","2.3.1-9ubuntu1.2","2.3.1-9ubuntu1.3","2.3.1-9ubuntu1.4","2.3.1-9ubuntu1.5","2.3.1-9ubuntu1.6","2.3.1-9ubuntu1.7","2.3.1-9ubuntu1.8","2.3.1-9ubuntu1.9","2.3.1-9ubuntu1.9+esm1","2.3.1-9ubuntu1.9+esm3","2.3.1-9ubuntu1.9+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.1-9ubuntu1.9+esm4","b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