CVE-2026-50240 in Builds for OpenShift
Summary
by MITRE • 11/07/2026
A flaw was found in OpenShift Pipelines-as-Code (PAC). PAC does not verify whether the creator of a Repository custom resource has permission to create PipelineRuns. A namespace user with only Repository and Secret create/delete permissions can cause PAC to execute attacker-controlled PipelineRuns as the auto-provisioned pipeline ServiceAccount, which carries ClusterRole/edit by default. This results in namespace-scoped privilege escalation, enabling Secret read, resource creation/modification/deletion, and potential supply chain injection in CI/CD namespaces.
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Analysis
by VulDB Data Team • 11/07/2026
The vulnerability identified within OpenShift Pipelines-as-Code represents a critical authorization bypass that fundamentally undermines the principle of least privilege in containerized continuous integration environments. The core technical flaw lies in the absence of proper access control verification when processing Repository custom resources. Specifically, the system fails to validate whether the user or service account initiating the creation of a Repository resource possesses the necessary permissions to trigger PipelineRuns associated with that repository. This oversight creates a significant gap between administrative intent and actual enforcement mechanisms within the CI/CD pipeline orchestration layer.
In practice, this flaw allows any namespace-scoped user who holds only basic create and delete permissions for Repository and Secret resources to exploit the system. By crafting a malicious Repository custom resource, an attacker can trick Pipelines-as-Code into automatically provisioning and executing PipelineRuns. These runs are not executed under the context of the requesting user but rather as the auto-provisioned pipeline ServiceAccount associated with that namespace or project. This architectural design choice is intended to simplify permissions for developers but becomes a severe liability when combined with insufficient input validation regarding the initiator's privileges.
The operational impact of this vulnerability is profound due to the default configuration of the affected ServiceAccount. By default, these auto-provisioned pipeline ServiceAccounts are bound to ClusterRole/edit within their respective namespaces or projects. This binding grants extensive permissions including reading secrets, creating and modifying workloads such as pods and deployments, deleting resources, and accessing persistent volume claims. Consequently, an attacker with minimal initial access can escalate privileges from a low-privileged namespace user to effectively gain full control over the target namespace. This escalation enables unauthorized data exfiltration through secret theft, disruption of services via resource deletion or modification, and potential persistence mechanisms within the cluster.
Beyond immediate namespace compromise, this vulnerability poses severe risks to software supply chain integrity. An attacker with write access to resources can inject malicious code into pipeline definitions or modify existing build scripts. This capability facilitates supply chain injection attacks where compromised artifacts are produced during the CI/CD process. Such actions can lead to the deployment of backdoored applications across downstream environments, affecting production systems and potentially compromising other namespaces if cluster-wide permissions are leveraged through lateral movement techniques facilitated by the elevated privileges obtained via this flaw.
From a classification perspective, this issue aligns with CWE-269 Improper Privilege Management as it involves an actor obtaining higher-level permissions than intended or authorized. It also relates to CWE-732 Incorrect Permission Assignment for Critical Resource because the system assigns powerful default roles without verifying if the triggering entity should have that level of access. In terms of MITRE ATT&CK, this vulnerability facilitates privilege escalation and can be leveraged in conjunction with techniques such as T1059 Command and Scripting Interpreter or T1608 Install Defenses for Evasion to maintain persistence within the compromised CI/CD environment.
Mitigation strategies must focus on tightening access controls and reducing the blast radius of automated pipeline execution. Administrators should immediately review and restrict the permissions assigned to auto-provisioned ServiceAccounts, moving away from broad ClusterRole/edit bindings toward more granular roles that limit actions to only those strictly necessary for specific build tasks. Implementing strict authorization policies using tools like OPA Gatekeeper or Kyverno can enforce rules that prevent users without explicit PipelineRun creation rights from triggering pipeline executions via Repository resources. Additionally, enabling audit logging and monitoring for unusual patterns in custom resource creation can help detect exploitation attempts early. Regularly updating to patched versions of OpenShift Pipelines-as-Code is essential as upstream developers may release fixes addressing this authorization logic gap.