CVE-2026-74020 in Koji Plugin
Summary
by MITRE • 08/20/2026
Unauthenticated Broken Access Control in Koji <= 2.2.1 versions.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified as an unbroken access control issue within Koji version 2.2.1 and earlier represents a critical failure in the application's authentication and authorization mechanisms, allowing attackers to perform privileged actions without valid credentials. This flaw fundamentally undermines the security model of the build system by exposing administrative endpoints or sensitive data retrieval functions that should be restricted exclusively to authenticated users with appropriate roles such as admins or maintainers. The absence of proper session validation or token verification at these specific entry points enables unauthenticated actors to interact directly with the backend services, bypassing the intended access control layers entirely.
From a technical perspective, this vulnerability typically manifests when API endpoints or web interfaces fail to enforce strict identity checks before processing requests that modify system state or retrieve confidential information. In many cases involving build systems like Koji, such flaws may involve improper validation of request parameters where the server assumes the presence of valid authentication headers based on previous interactions rather than verifying them for every individual transaction. This oversight allows an attacker to craft HTTP requests with arbitrary payloads that trigger administrative functions, such as creating new users, modifying package metadata, or initiating builds under different identities. The root cause often lies in misconfigured middleware rules or missing decorators in the application framework that are responsible for enforcing role-based access control policies consistently across all exposed interfaces.
The operational impact of this vulnerability is severe due to Koji's central role in managing software build pipelines and package repositories, which are frequently used by Linux distributions and enterprise environments. An unauthenticated attacker could exploit this flaw to escalate privileges within the system, potentially gaining full administrative control over the build infrastructure. This level of access allows for significant malicious activities including the injection of compromised code into official packages, manipulation of dependency trees to introduce supply chain vulnerabilities, or exfiltration of sensitive source code and configuration details stored in the repository database. Furthermore, attackers could disrupt service availability by deleting critical builds or corrupting metadata, leading to widespread instability for downstream consumers who rely on these artifacts for their own development cycles.
This vulnerability aligns with CWE-284 Improper Access Control as it describes a situation where an actor is able to access resources or perform actions that they are not authorized to do due to insufficient enforcement of restrictions. Additionally, the exploitation technique maps closely to MITRE ATT&CK techniques related to Initial Access and Privilege Escalation, specifically involving unauthorized API consumption and credential abuse through bypass mechanisms. The lack of authentication serves as a direct pathway for lateral movement within internal networks if the build system is integrated with other trusted services that trust its outputs implicitly without further verification.
Mitigation strategies must prioritize immediate remediation by upgrading to Koji version 2.2.2 or later where these access control checks have been rigorously implemented and tested. Organizations running older versions should implement network-level controls such as firewall rules or reverse proxy configurations to restrict direct external access to the administrative interfaces of the build system, ensuring that only trusted internal subnets can reach these endpoints until an upgrade is feasible. It is also advisable to audit existing logs for signs of unauthorized API calls and review user permissions to ensure no excessive privileges have been granted inadvertently during previous operational periods. Regular security assessments focusing on authentication flows and access control logic should be integrated into the development lifecycle to prevent similar misconfigurations in future releases.