CVE-2026-87876
Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)
CVSS Score
3.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-178 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Sep 9, 2026 |
| Last Updated | Sep 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected References
access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-87876 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2530991 github.com: https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8 github.com: https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb github.com: https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
Credits
Red Hat would like to thank arbor-s (Independent Security Researcher) for reporting this issue.