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CVE-2026-27447

cups: OpenPrinting CUPS: Authorization bypass via case-insensitive username comparison

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Severity

Moderate

Red Hat Product Security

6.4

CVSS 3.1

Review impact separately from score.

Published · April 4, 2026

Updated · September 1, 2026

Description

A flaw was found in OpenPrinting CUPS. This authorization bypass vulnerability allows an unprivileged user to gain unauthorized access to restricted operations. This can be exploited by using a username that differs only in case from an authorized user during authorization checks.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 6.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CWE-178 · Improper Handling of Case Sensitivity