SB2026100961 - Fedora 44 update for rabbitmq-server
Published: October 9, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-67420)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to publish messages with a foreign AMQP user_id after that privilege should have been revoked.
The vulnerability exists due to improper access control in rabbit_access_control:update_state/2 and rabbit_access_control:check_user_id/2 when refreshing an existing AMQP connection from an OAuth token that no longer grants the impersonator tag. A remote user can refresh the connection with a same-username token that omits the impersonator tag to publish messages with a foreign AMQP user_id after that privilege should have been revoked.
Only connections that previously held the impersonator tag are affected. The issue requires a refresh-capable OAuth backend for AMQP, a successful credential refresh before the original credential-expiry timer closes the connection, and it affects both existing and newly opened channels on the refreshed connection.
Remediation
Install update from vendor's website.