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.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Red Hat Red Hat Enterprise Linux 10 affected —
Red Hat Red Hat Enterprise Linux 6 affected —
Red Hat Red Hat Enterprise Linux 7 affected —
Red Hat Red Hat Enterprise Linux 8 affected —
Red Hat Red Hat Enterprise Linux 9 affected —
Red Hat Red Hat Enterprise Linux 9 affected —
Red Hat Red Hat Hardened Images affected —
Red Hat Red Hat OpenShift Container Platform 4 affected —

No data.

No data.

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No data.

Project Subscriptions

Vendors Products
Redhat Subscribe
Enterprise Linux Subscribe
Hummingbird Subscribe
Openshift Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/security/cve/CVE-2026-87876 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2530991 cve-icon cve-icon
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2 cve-icon cve-icon cve-icon
History

Wed, 09 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 09 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
Weaknesses CWE-178
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-09T18:11:06.354Z

Reserved: 2026-09-09T13:58:06.399Z

Link: CVE-2026-87876

cve-icon Vulnrichment

Updated: 2026-09-09T18:10:01.126Z

cve-icon NVD

Status : Received

Published: 2026-09-09T17:17:53.377

Modified: 2026-09-09T17:17:53.377

Link: CVE-2026-87876

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T18:30:13Z

Weaknesses