{"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":"2026-07-27T09:24:10.354836Z","published":"2026-04-03T21:11:59.734Z","related":["SUSE-SU-2026:21787-1","SUSE-SU-2026:21836-1","SUSE-SU-2026:21850-1","SUSE-SU-2026:21871-1","SUSE-SU-2026:2718-1","SUSE-SU-2026:2732-1","openSUSE-SU-2026:10589-1","openSUSE-SU-2026:20812-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27447.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-863"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27447.json"},{"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"},{"type":"FIX","url":"https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openprinting/cups","events":[{"introduced":"0"},{"fixed":"88516bf6d9e34cef7a64a704b856b837f70cd220"}],"database_specific":{"cpe":"cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"2.4.16"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.4rc1","v2.4b1","v2.3.3op2","v2.3.3op1","v2.3.3","v2.3.1","v2.3.0","v2.3rc1","v2.3b8","v2.3b7","v2.3b6","v2.3b5","v2.3b4","v2.3b3","v2.3b2","v2.3b1","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.2rc1","v2.2b2","v2.2b1"],"database_specific":{"vanir_signatures_modified":"2026-07-27T09:24:10Z","vanir_signatures":[{"signature_type":"Line","signature_version":"v1","source":"https://github.com/openprinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220","target":{"file":"scheduler/auth.c"},"deprecated":false,"digest":{"line_hashes":["176410143507355983294686101745328094369","115792395960735883771031320264469884721","135803717691476411825697998077932116207","15424156163291787898771581584915379929","120159171580599956410117718006041538495","225684204883454819845312418647600792057","167917337984149193837649330828183126558","42576025254109609475844479046551153644","203451318150926783078270546881530624118","83225245274089313078095274200200206486","21131427354955727502024260087251600933","98907988471480144369036382542787974728","231767634043447334001081408555918870490","147099455136125777772392495595352119725","124984009242917229298563710533862992123","176093930449248608742716230876999423999","116314721378060575864101780567823109522","25492270040618489791059604830968291741","40982160569122594518117613264420660995","231297760216475671602390663204719588686","56065336540310778795803205510786277516","2279732709940580555618036312256163999","283562889683504142252572169100790928288","270335933995058196395868664161701540741","160869365900250851240417119813137631545","14642659824781436975204801126160201989","68001646181108637465845052831812894087","62157241115842724479385905450330649141","149472562226488825573754007569635977410","205276668302131435168663366645767543537","55340116071575073625551515271516629609","262209548606140328929408740926690049984","108258868073512654495180403420069176282","44966827632852408863057524427078114142","42855598644245201361281865265195749468","318118673100323177856516085204320953977","208649811365641460174992021559223564598","70177316613792701867660416032538760833"],"threshold":0.9},"id":"CVE-2026-27447-a583b177"},{"digest":{"length":1656,"function_hash":"301946086184399924173053728711547405119"},"id":"CVE-2026-27447-ceea831d","signature_type":"Function","signature_version":"v1","source":"https://github.com/openprinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220","target":{"file":"scheduler/auth.c","function":"cupsdCheckGroup"},"deprecated":false},{"source":"https://github.com/openprinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220","target":{"file":"scheduler/auth.c","function":"cupsdIsAuthorized"},"deprecated":false,"digest":{"function_hash":"171918984847480217483569706055594429153","length":8660},"id":"CVE-2026-27447-d2a45f49","signature_type":"Function","signature_version":"v1"}],"source":"https://storage.googleapis.com/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"}]}