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Test your applicationsUpgrade RHEL:9 cups to version 1:2.3.3op2-33.el9_6.1 or higher.
This issue was patched in RHSA-2025:15700.
Note: Versions mentioned in the description apply only to the upstream cups package and not the cups package as distributed by RHEL.
See How to fix? for RHEL:9 relevant fixed versions and status.
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.12 and earlier, when the AuthType is set to anything but Basic, if the request contains an Authorization: Basic ... header, the password is not checked. This results in authentication bypass. Any configuration that allows an AuthType that is not Basic is affected. Version 2.4.13 fixes the issue.