CVE-2026-27447
cups: OpenPrinting CUPS: Authorization bypass via case-insensitive username comparison
Severity
ModerateRed Hat Product Security
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 · 6.4CVSS: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