Red HatCVE-2026-87876
Two case-insensitive comparisons on request-derived usernames outside the main...
Low3.0CVE-2026-87876 · Published Sep 9, 2026 · updated Sep 21, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 6 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 7 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 8 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 9 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat OpenShift Container Platform 4 Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-178
- www.cve.org/CVERecord?id=CVE-2026-87876
- nvd.nist.gov/vuln/detail/CVE-2026-87876
- access.redhat.com/errata/RHSA-2026:67568
- access.redhat.com/security/cve/CVE-2026-87876
- bugzilla.redhat.com/show_bug.cgi?id=2530991
- github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8
- github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb
- github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 9 | Red Hat memcached cache plugin of the community: remote code execution | High8.1 | No fix yet |
| Sep 9 | Red Hat Enterprise Linux 10: out-of-bounds read | Medium4.3 | No fix yet |
| Sep 9 | A flaw was found in SSSD's IdP authentication provider | High7.5 | No fix yet |
| Sep 9 | Red Hat Ceph Storage 5: improper certificate validation | Medium6.8 | No fix yet |
| Sep 9 | Red Hat FreeIPA. An unauthenticated remote attacker: cross-site scripting | High8.1 | No fix yet |
| Sep 9 | Red Hat bubblewrap. During sandbox setup: link following | High8.8 | No fix yet |