{"id":"CVE-2026-27447","state":"PUBLISHED","title":"OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup","description":"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.","publishedAt":"2026-04-03T21:11:59.734Z","updatedAt":"2026-04-06T18:50:21.909Z","severity":{"score":4.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["OpenPrinting cups"],"affected":[{"vendor":"OpenPrinting","product":"cups","versions":[{"version":"<= 2.4.16","status":"affected"}]}],"references":["https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9","https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27447.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27447","state":"PUBLISHED","datePublished":"2026-04-03T21:11:59.734Z","dateUpdated":"2026-04-06T18:50:21.909Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-19T17:25:31.100Z"},"containers":{"cna":{"title":"OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"OpenPrinting","product":"cups","versions":[{"version":"<= 2.4.16","status":"affected"}]}],"references":[{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9","name":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220","name":"https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-03T21:11:59.734Z"},"source":{"advisory":"GHSA-v987-m8hp-phj9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-06T18:49:46.413933Z","id":"CVE-2026-27447","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-06T18:50:21.909Z"}}]}}}