{"id":"CVE-2026-87876","title":"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 certai…","summary":"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 certai…","severity":"low","cvss":3,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N","cwe":["CWE-178"],"vendor":"Red Hat","product":"cups-main","affected":["cups-main (all versions)","cups (all versions)","cups (all versions)","cups (all versions)","cups (all versions)","cups (all versions)","rhel9/cups (all versions)","rhcos/rhcos (all versions)"],"published":"2026-09-09","updated":"2026-09-21","sourceUpdated":"2026-09-21T12:17:22.543","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87876","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:67568","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-87876","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2530991","label":"secalert@redhat.com"},{"url":"https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8","label":"secalert@redhat.com"},{"url":"https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb","label":"secalert@redhat.com"},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2","label":"secalert@redhat.com"},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87876.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-87876"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87876"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-09T18:09:43.830591Z"},"epss":0.004,"epssPercentile":0.34084,"ingestedAt":"2026-09-11T14:42:19.866Z","patched":["hardened_images"],"slug":"CVE-2026-87876","body":"## Overview\n\nTwo 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:67568** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67568)\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87876.json)","depth":"twilight","depthScore":29,"depthScoreParts":{"impact":16.5,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":23557,"id":"CVE-2026-87876","ts":1788981628956,"field":"exploit_available","old":"false","new":"true"}]}