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oss-secCVE-2026-56098: Katello: gistry Proxy authorization bypass (fixed in 4.21.2, 5.0.1)

Hi,

A security fix has been released in Katello, a content management plugin for Foreman.

CVE-2026-56098: Katello: Registry Proxy authorization bypass

An authenticated low-privilege user can bypass Registry Proxy authorization checks and enumerate organizations and products through response differences.

Affected versions: Katello 4.13.0 through 4.21.1.1, and 5.0.0 CVSS: 4.3 (Moderate) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Fixed versions: Katello 4.21.2 and 5.0.1 Credit: Guilherme Suckevicz

References: - Foreman Security: https://theforeman.org/security.html#2026-56098 - Redmine: https://projects.theforeman.org/issues/39844 - Fix: https://github.com/Katello/katello/pull/11887

Thanks, Ondrej Gajdusek Foreman Release Team

First published (updated )
https://seclists.org/oss-sec/2026/q4/62

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